Subzero and ryu will both starts launching off their blasts, and sooner or later one of them is going to hit. If ryu hits subzero, subzero will only take some damage and get knocked off his feet. If ryu gets hit by one of subzero's blasts ryu will freeze unable to attack zero and unleash combo after combo till ryu recovers from the attacks. So, say if they both hit each other at the same time, ryu's blast will knock sub zero down and subzero will freeze ryu, it will only take like a few seconds for subzero to recover from the hit and starts hitting ryu. As for sub zero's ice copy thing well thats for if ryu does a dragon upper cut thing or does one of the kick thing (sorry didn't bother to remember the names from the games just.....know the buttons. lol) then ryu gets frozen again. Then sub zero will start hiting him again.
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