Yeah, certainly there are many different kinds of bread. I’m sure I was overly broad in designating all dough made with butter as pastry. I was responding to the previous comment , which I interpreted as implying that butter(or bonemeal, in a pinch) is a necessary ingredient in bread.
Perhaps the Balrog underestimated Gandalf, thinking it could cast him into the abyss, then fly back up to deal with the rest of the Fellowship. Alternatively, maybe it calculated that its best chance of defeating the wizard was to grapple with him at close quarters. Either way, the Balrog falling doesn’t necessarily mean that it wasn’t capable of flight.