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Interesting. I had the same thing happen once, but I THOUGHT I fixed it. I'll go and investigate and see if I can narrow down what is happening. 
Sorry for the inconvenience, and thank you very much for the feedback!

Ahh! Ok, I found it. Apparently when the other Mage's Port in I forgot to delete the code from their objects themselves. So if you "interact" with them "by clicking or pressing enter" there is a split second chance that you can re-initiate the battle.  I just removed the code and will try to re-upload when I have a moment. Thanks again for pointing this out!