I have twins.If he had a history of psychotic illness, then he should have a history of taking medication too. And they will need to check out his twin brother, since biologically, they will be the same. They haven't said if he had any history of acting out in this manner, that's what makes me wonder if something happened at the meeting. Maybe he was slipped a drug that altered his mental state?
Just because one twin may have a mental illness does not mean the other twin will as well