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But why is it their problem if the player doesn't want to spend 200 mana to check the number?
I'm all for fixing bugs. On DF2, I posted an algorithm for handling such battles; I'll try to post it tomorrow. It will naturally include code, but with descriptions so it's clear what's what. The main point is that the snakes simply didn't move away from the hydra during a quick attack, but, to be fair, it's not entirely accurate, but for those who are unfamiliar with code (especially pseudocode), it's quite sufficient. The same story with the flyers.