mental illness probably. isolation, throw in the gun range, throw in mom's hesitancy to take meds. you had a lot converging. and there were two years of just abject isolation. kid is hardly coming out of his house. >> i'm also struck by how much of his own communication in writing or online that you were able to go through that was released. he wrote this to a fellow video game player at one point. i incessantly have nothing other than scorn for humanity. i have been desperate to feel something positive for someone for my entire life. in a strange way, you have probably spent more time with adam lensa than anyone else, did you get a sense of what was the trigger that pushed him over the edge? >> not exactly. you know, the abcd of it, but