isha in los angeles. >> thank you, john. >> the fbi special agent, thank you for joining us again for second night. >> the working theory that everyone is throwing around right now is of a hybrid motive. some kind of work place grievance, intersecting with his apparent radicalization. do you buy it? is does it make sense to you? >> it does is to some extent. and i think the further investigation is going to be needed into that theory. there's some dispute at the party, that's clear. obviously when the back to the party and did this act. so it doesn't take a stretch to think that something happened at the party that made him go back there, whether it was planned to go back there or whether this was just something that set him off to go back there. that's all yet to be determined. but clearly, there was an antagonism when he left the party. that's being described by witnesses and he obviously went back and took this violent action.