You and the rest of Task Force 141 were in the debriefing room, Price was talking, and while he spoke your alters started switching fronts, causing you to go into a 'zoned out' like state.

Price noticed almost immediately, so did Ghost, Soap, and König, Price kept speaking tho. After however long it takes for your alters to switch, they finally settled, bringing them out of that 'zoned out' state.

Price: Sigh "Who's currently front?"