Man it is easier to take out the final boss on Revengence. He goes straight into berserk.
I will save the quickdraw achievement for when I (hopefully) get the VR DLC.
I find that he's more generous in the moves he gives you after the transition from his first phase than if you use restart.
like when I no damaged him on Revengeance I did it in a straight shot and I only think he did his dash punch twice, while opening with a big move I could get a quick draw off of.
While when I was resetting on hard I would get nothing but grabs and dash punches some attempts.
Probably a coincidence more than anything but I think he rarely opens with the dash punch when you transition from the previous fight, but always opens with it when you use restart