John is too fresh from that horrible wrenching end to think of anything else. To him, what happened is obvious and Pratt is wasting his time with pointless questions when Arthur could be out there on this ship in god only knows what state. It doesn't matter that he woke up just fine, that he has his memories of the ship back, that he knows how death works here - all of that is overshadowed by the sound of Arthur's screams playing back through his head, the sounds of him choking on his own blood and his hands-

"I mean it's Arthur's fucking blood!" John snaps. "Where the fuck is he?!"

In John's mind, it's just as obvious that his need to find Arthur is out of concern. He does not connect how his extremely aggressive body language and actual language could run counter to that to anyone else watching, even including Arthur himself.

It should be noted at this point, that John's clothes seem the bloodiest right below the neck.