This skip simply enables Vergil to avoid the first major sequence of Mission 10. The introduction of Faust and Laser Barriers to activate the Blue Mechanism.
General Info
Be wary of the cutscene trigger as this will end up messing the OoB setup.
The Alt + Enter must be done instantly as soon as you press Trick up to clip through the elevator. It will force Vergil to fall all the way to the ground.
Might be ideal to pause for the FPS to be stable before landing.