Two Betrayals Glitch Tutorial - BOOL (Banshee Out Of Level)

On the level Two Betrayals, there's an insane glitch where you can take a Banshee outside of the loaded zone and travel throughout most the mission without walls and enemies. Speedrunners use this in their runs a lot, but I have yet to find a tutorial that really teaches what is happening, so here it is. What the Glitch Looks Like : 1:17 Explanation : 1:54 Step by Step Tutorial : 4:23