Left it hanging, because I don't know what is actually in that room, but I doubt it will be too problematic, and the occupants shouldn't be too badly hurt: temporary eye and ear damage is easily curable by today's medicine, wizards should have it on lock, and hopefully in their incredibly painful daze they are unable to avoid being knocked unconscious. It is a little rough, considering they are most likely employees, but Billy is following the commanders primary directive, to first and foremost protect the lives of those under his command.