I thought it was just dont die, but some runs the glitch state doesnt activate and I got lasers, good aim shooty knight, and skeletons all over me on 0 death.

Skeletons spawning feels very random to me. Haven't really looked into it since only grey knight cares if they spawn or not and I'm not manly enough to run that yet.

Shooty knight's aim is always the same, but he can have faster movement speed (which allows for better checkpoint 6 start). As far as I know he gains the extra speed in his very last transition in checkpoint 8 when he moves to his last resting place (murder by spikes).