Well... that news means one of two things. Either this is a full psychotic snap, which he isn't discounting, or something has actually happened. Either way this isn't a memory. And when it isn't a memory it's... easier.

David stands a little straighter, walks with a little more confidence. "So, if this isn't the middle of an overwhelming war against Covenant forces and you aren't Agent York of Project Freelancer, why do you have a SPARTAN Mark VI helmet?"