Was he blinded when he entered the area? If not, he may have a pretty clear idea of other places to teleport outside of that range that he saw. My personal DM style is to do what makes sense. And since he "saw"(assuming he wasn't blind when he entered the area) the other places, I'd allow it, though I might require an intelligence check to remember clearly enough.
If not, I'd rule that he took the damage. As I said earlier, I can see ruling it in either direction. In my mind teleportation is instantaneous with disappearance and reappearance happening simultaneously, so the sound would strike the caster. If I were with a DM who felt that there were three discrete events and the sound would not affect me, I wouldn't argue it. Not because it helped me, but because that is also a reasonable interpretation.