I join you in battle, fist clenched tight

Question: I join you in battle, fist clenched tight.
We pound three times with all our might.
If my rival decides he will sign for peace;
I'll crush him, and the fight will cease.
But if he lays his hand down flat;
I'll suffer defeat, that is that.

What am I?

Origin: http://www.reddit.com/r/riddles/comments/29cwvb/looking_for_feedback_on_this_riddle/

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