my reaction to beating the guy was THAT WAS SO MUCH FUCKING EASIER WHEN HE'S NOT SHOOTING HIS SPINNING MACHINE GUN LASER BEAM EYES DURING HIS FINAL FORM. ALSO STOP SLACKING OFF AND FINISH THE REST OF THE ENDING.
Now that I'm thinking about it, I'd much rather see the spinning machine gun rather than the burning floor, even if it is harder.
hahaha no, this was spinning machine gun WITH burning floor.
Needless to say, I never beat him while activating this glitch, and eventually realized that my own skills were causing me grief. Basically, at first, you could shoot The Guy's eyes while the machine gun lasers were spinning. If you knocked out both of them before he completed the rotation, it went straight to his third form, burning floor and all, and the lasers kept turning. It wasn't until I STOPPED killing the hell out of his eyes during that phase that I realized I'd been doing it wrong the entire time and Kayin wasn't just fucking with me.