Hydras are well, let's not mince words, evil. They're supposed to be evil, big and nasty. They're supposed to tear at your flesh, flash freeze you, flambe you, swallow you whole, and do all manner of horrible things to you, all at the same time. But it's a timing thing. All of their special attacks go off at the same time. Which means they can squash just about anything, like a bug, any time. I'm wondering if it might be a bit more appropriate if instead of using all their breath weapons at the same time, all the time, if each head randomly spewed at appropriate intervals. So they would use a breath weapon about five times more often then your typical dragon, and they might randomly use two or three at the same time once in a while, but they wouldn't use all their breath weapons, at the same time, EVERY time. It's just a thought. Submitted with humility, and in the spirit of cooperation and... stuff... beer?