Apparently these two dragons hadn't heard about that rule. One would strafe the area with ice while the other circled around for another pass. They took turns like that for a while, never letting me have a moment's rest. Occasionally, they would both perch on either side of the main street through Winterhold and frost blast simultaneously. I'd rank it as my favorite and most challenging dragon fight so far.
Has anyone else had a fight with multiple dragons (like I said, I didn't even think it was possible until it happened to me), and if so, what's the maximum number of dragons anyone has had in a fight?