I noticed that Cesar and Roll's characters enter the fighting animation when they tried to grab each other at the same time. I love how they implemented that in co op mode even tho the mode isn't finished/optimized.
When you asked about John Ghost being so fast, heres an explanation. When John Ghost appears, he has an INSANE amount of rubberbanding. He will constantly check the player's current position, and if the player is within a certain distance with him, he'll either slow down or speed up.