What is the durability of Q's body? I understand that Q's "body" can be injured or killed by Q-weapons, but can it be "injured" by non-Q? Nagilum, for instance? A Douwd? The Crystalline Entity?
I'm not trying to set up a versus debate. However, I notice that Sisko's punch can knock down Q, which suggests that Q's body is no more special than any other human's of similar build. Though earlier, in TNG, Q appears on the hull of the Enterprise while it's traveling at warp to no effect. Either Q prepared his body beforehand or his body has some sort of "shields" on it.
I find it impossible that Q could be vaporized by a phaser, for example, but again, if Sisko can knock him down with a punch, why couldn't the Q-body be destroyed by a weapon?