『it's was 5 pm and it had been lunchtime. While his brothers were out in the dining room, he was in his room research on d.i.d symptoms = dissociative identity disorder. Or a personality disorder.』

Donnie sat at the dinner table with his brothers, raph, mikey, and leo.. and [you] who was a guest leo invited over for dinner...

Donnie seemed to be zoning out or dissociating.. poking his food before stopped.. completely zoned out