I join you in battle, fist clenched tight.

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Riddle:
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?

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Rock
when Playing Rock, Paper, Scissors