I went through all documents but found nothing about how some of the glitches are performed and since the defib is useless in solo runs, if there's a way to utilize it, I wanna learn how it works

You need to have 3 people and a defib, one camping the lever, and the other 2 on the real door, 1 person dies to the speaker, the other revives asap, and pull the lever when the person that died is being revived, thats it.