This is the first skip in the DMC series where a player can avoid mandatory boss fight. Only Vergil can do this by going OoB from the first ring floor. Although, he must back-track to Foris Falls to dam off the waterfall.
General Info
For some reason, it's required to fall off from the first ring to enable Vergil's ability to clip. As you fall do Trick up → StarFall to land on the first ledge.
The Alt + Enter must be done during StarFall animation, which is why the Jump was done backward.
The game should be paused briefly so the FPS goes back into 120.
Navigate the control board by the map as demonstrated in the video reference.