A Reverse Back in Time Warp (BiTWarp) is a glitch that allows you to spawn in any area that is past a loading that can be accessed during Back in Time, using the coordinates you saved at on the surface. Such areas include Skyloft, every building on Skyloft, but also the Sky. Using Faron BiT this also adds the Sealed Grounds, Faron Woods, Deep Woods, Ancient Cistern, Skyview Temple, Eldin Volcano or Hylia's Realm for exemple.
To perform a Reverse BiTWarp:
This also works without doors. More generally you want to move over to the loading zone that leads to the area you want to warp to, start your file, then start the loading process that leads you to the wanted map during the loading fadeout.
The game will load your file's XYZ coordinates, but the loading process will set your map to be the place you entered. Everything else about the file remains unchanged, including the spawn locations; if you deathwarp you'll end up back where you saved on the surface. Thus when your file loads, you will be in the place you entered during BiT, but spawn at an unusual set of coordinates.
If your file was saved at a save prompt (instead of a statue), or is a new game file, performing a Reverse BiTWarp to anywhere will simply cause the area to load normally. This is extremely useful when your only goal is to load a small area (where most statues would put you OoB). Where this shines the most however is that Reverse BiTWarping into cutscenes when saved at a save prompt will allow the cutscene to play as intended. If you were saved at a statue instead you would just Reverse BiTWarp into the cutscene map without the cutscene playing, which can cause some glitchy behaviours. An exemple of a trick that is only possible when saved at a Save Prompt is Early Sky Keep.
Note: If you perform a Reverse BiTWarp and then die without saving, you will respawn at the statue you were saved at before performing the Reverse BiTWarp. As an exemple, that means you could totally die on Skyloft (after a Reverse BiTWarp to Skyloft) but respawn on the Surface after killing yourself (if it was a Reverse BiTWarp from a Surface save location).
For the longest time, the Reverse BiTWarp from Statues had no known uses. The closest theoretical use was to use a Reverse BiTWarp to enter Owlan's room to learn Spiral Charge. This would have allowed for the Sailcloth to be skipped in full game runs, since the only reason we needed it was to unlock Owlan's door to learn the Spiral Charge. However, the closest statue still spawns you either out of bounds or on the stairs leading from the first to the second floors of the academy.
The Reverse BiTWarp from a Save Prompt had a few known uses, such as Early Sky Keep and Early Light Pillar, but nothing that was significant for main categories.
However, with the discovery of Faron BiT, checking all the possible Reverse BiTWarps possibilities on the surface became necessary. It turned out that it was possible to obtain the Boss Key early in the Ancient Cistern from several statues, which saved a lot of time in JP speedruns by both allowing a way to get to the basement early combined with a way to enter the Ancient Cistern without healing the Water Dragon.
This table lists all possible statues usable for Reverse BiTWarps, and the locations you end up in both in Skyloft proper and the Knight Academy. Any other building is too small, and Reverse BiTWarps end up out of bounds (OoB).
Any OoB warp in the Knight Academy is an infinite void softlock.
|Saved Statue||Skyloft||Knight Academy|
|Sealed Grounds||OoB (Respawn: Lower Academy Stairs)||OoB|
|Sealed Temple||OoB (Respawn: Plaza)||OoB|
|Behind the Temple||OoB (Respawn: Bazaar Windmill Platform)||OoB|
|The Great Tree||On top of Bazaar||OoB|
|In the Woods||OoB (Respawn: Plaza)||OoB|
|Viewing Platform||In lake near waterfall cave||OoB|
|Faron Woods Entry||OoB (Respawn: Lower Academy Stairs)||OoB|
|Deep Woods||OoB (Respawn: Plaza)||OoB|
|Underwater Statue||OoB (Respawn: Plaza)||OoB|
|Lake Floria||OoB (Respawn: Plaza)||OoB|
|Floria Waterfall||OoB (Respawn: Bazaar/Scaffolding)||OoB|
|Statue in Water Room||OoB (Respawn: Near River/Plaza)||OoB|
|Statue Near Beetle||OoB (Respawn: Academy Boxes)||OoB|
|Boss Door Statue||OoB (Respawn: Goddess Statue Chest or Sky Keep Entrance)||OoB|
|Basement Spout||OoB (Respawn: Bazaar Windmill Platform)||OoB|
|Lilypad Spout Room||OoB (Respawn: Scaffolding Platform)||OoB|
|Statue above Rope||OoB (Respawn: Bazaar Windmill Platform)||OoB|
|Ceiling Statue||Near Bazaar statue||OoB|
|Volcano East||Inside Light Tower||OoB|
|Temple Entrance||OoB (Respawn: Behind Goddess Statue)||OoB|
|Volcano Entrance||OoB (Respawn: Lower Academy Stairs)||OoB|
|Volcano Ascent||Near Crate by Piper's house||OoB|
|Mogma Turf Statue||OoB (Respawn: Batreaux's House)||OoB|
|Volcano Summit||OoB (Respawn: Bazaar Windmill Platform)||OoB|
|Outside Fire Sanctuary||OoB (Respawn: Upper Academy Statue)||OoB|
|Inside the Fire Sanctuary||OoB (Softlock)||OoB|
|Entrance Statue||OoB (Respawn: Plaza)||OoB|
|Lava Room Statue||OoB (Respawn: Near River/Plaza)||1F Classroom|
|Lava Tunnel Statue||In lake near waterfall cave||OoB|
|Boss Door Statue||OoB (Respawn: Academy Roof)||OoB|
|Statue after First Door||Bazaar||2F Stairs|
|First Circular Statue||Near shed||1F Kitchen|
|Outside Magmanos Statue||OoB (Respawn: Academy Roof)||OoB|
|Second Circular Statue||OoB (Respawn: Academy Roof)||OoB|
|Lavafall Statue||OoB (Respawn: Remlit Meadow)||OoB|
|Inside the Fire Sanctuary||OoB (Softlock or Sky Keep Entrance)||OoB|
|Mine Entry||OoB (Respawn: Plaza)||OoB|
|Desert Entrance||OoB (Respawn: Plaza)||OoB|
|Stone Cache||OoB (Respawn: Graveyard Platform)||OoB|
|North Desert||OoB (Respawn: Academy Boxes)||OoB|
|West Desert||OoB (Respawn: Lower Academy Stairs)||OoB|
|Desert Gorge||OoB (Respawn: Lower Academy Stairs)||OoB|
|Temple of Time||OoB (Respawn: Academy Roof)||OoB|
|Lanayru Gorge||OoB (Respawn: Bazaar Windmill Platform)||OoB|
|Lanayru Sand Sea|
|Ancient Harbor||OoB (Respawn: Bazaar Windmill Platform)||1F Classroom|
|Skipper's Retreat||OoB (Respawn: Plaza)||OoB|
|Shipyard||OoB (Respawn: Plaza)||OoB|
|Pirate Stronghold||OoB (Respawn: Bazaar Windmill Platform)||OoB|
|Lanayru Mining Facility|
|Entrance Statue||OoB (Respawn: Bazaar Windmill Platform)||1F Classroom|
|Bottom Statue||OoB (Respawn: Upper Academy Statue)||OoB|
|Top Right Statue||OoB (Respawn: Goddess Statue Platform)||OoB|
|Top Left Statue||OoB (Respawn: Remlit Meadow)||OoB|
|Entrance Statue||OoB (Respawn: Bazaar Windmill Platform)||OoB|
|Near Boss Door||OoB (Respawn: Bazaar Windmill Platform)||OoB|
|Near Boss Key||OoB (Respawn: Near River/Plaza)||OoB|
|Lumpy Pumpkin||OoB (Respawn: Graveyard Platform)||OoB|
|Isle of Songs||Plaza||OoB|
|Upper Academy||Upper Academy||OoB|
|Lower Academy||Lower Academy||OoB|
|Waterfall Cave||Waterfall Cave||OoB|
|Hylia's Temple||OoB (Respawn: Plaza)||OoB|
|Save Prompt||Loads area normally|