How to Counter a Stun

So, I have noticed every time I try to stun a person a few occasions they would actually counter my stun and they would then execute me. Does anybody know how to do this? Any idea?

I was actually wondering the same thing, but I feel like you just need to keep mashing the assassinate button when someone stuns you.

i've noticed this in the team game type i forget what it's called sorry. Whenever i got stunned, i saw the Y button appear above my character's head. So maybe mash Y or triangle, sorry i don't have a ps3 so not sure of the controls. idk though i have never tried it before but if you try it please tell me if it works lol.