"I'm fairly sure he won't be able to reach us, but I can't be certain since magic is, in fact, a thing. I'll turn off all exterior sound pickups, change the damper harmonics to create white noise, lower the resolution on all the cameras until we can't see him writing anything unless he writes it with trees, in which case I'll have enough warning to blast whatever he's trying to write with phasers. I apparently can't shoot him, but I could light fires between him and us. Can he project his voice through walls? That would be a problem."