I personally think "calmed" is far more poetic than "stopped" because you don't stop being angry, you lose your anger by being calmed. I personally think you should leave it as "calmed" Masa. It's something that makes complete sense in English as well as being more of the opposite of anger than just to stop it. Does that makes sense? Really, to me, "calmed" just reads as so much more meaningful than "stopped".
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