I figured out if you flick the left stick forward, while at the same time tapping R1 (Ps3) then I almost always do a finishing move. I think there are some stipulations to it though. Like having the health down low enough, and I've noticed if i'm alot higher level than my opponent I can do a finishing move right from the get go. I read allot online that it was random but I've tried it quite a few times now and it never fails (maybe i'm wrong?). Try and see if it works for you.

I figured out if you flick the left stick forward, while at the same time tapping R1 (Ps3) then I almost always do a finishing move. I think there are some stipulations to it though. Like having the health down low enough, and I've noticed if I'm a lot higher level than my opponent I can do a finishing move right from the get go. I read allot online that it was random but I've tried it quite a few times now and it never fails (maybe I'm wrong?). Try and see if it works for you.