Yeah I don’t know why it’s possible to do that... I found it out myself as well, can’t think of any possible explanation, you just need to fly high enough in the spawn area and it either sends you back to spawn, or to that cutscene.

As I see it there are 2 types of invisible walls: The wind that will prevent you from going out of the playzone and the ones that detect that you are out of the playzone, those will teleport you to a spawn point, and there's a chance you will the cutscene (it works 2/3 times for me)

But I still can't get the thing they do at the temple, could someone explain the strat or make a guide for that part??

I can get it inconsistently, you just have to jump between the gap in the window and the wall and hope you clip in (at least that’s what I do).