since I don't speedrun myself I don't have any capture of the glitch, and I do have trouble remaking it. however, I think I found a glitch.

as you know, falling for more than two stories of a building counts as an instant death. however, I managed a few times to cancel the kill plane by getting through a window.

this is already know, however, I did manage to do it AFTER falling for more than two stories. I think this has to do with movement (aka, already having speed to go towards a window before hitting the kill plane) and hitting the window before the characters animation change to the instant death.

usually, when I managed to do it, It usually went like this : Fell through the window going right, going left when at the same height as the second window, and, as the death scream begins, hitting the window 3 stories down from the start.

I hope this will be useful to speedrunners. good luck!

I managed to find a way to record myself and, while attempting the speedrun, not only did I find the glitch, but I found a second one that could be very useful for the 100% category :

the fall glitch can be found is at 1:11. I don't know what triggers it the other glitch is at 0:09 : basically, I get punched by a guy, but when the level ends, I still get the checkmark for completing the mission "do not get punched" ("ne te fait pas frapper" in french). I think it's because, since I reacted fast enough with kimmy's katana, it cancels the punch

hope these discoveries will help revive this community.

I think I might know what causes the fall glitch to work.

It could be that every time your character smashes through two windows, it resets their falling speed. Only if you fall the space of roughly 2 and a half stories, your character will be locked in their falling to death animation.

The wall of the building could also be effecting it but it's hard to tell.