He got a little animated. It looked like things were a little animated at the time, though. He got fired because he wasn't winning and maybe other things, though. I think that was just the last straw. He was originally part of Peterson's staff, and my take is that Peterson wasn't shady. So maybe Lake is OK as a human. I really don't know.
I expected Peterson to resurface as a head coach somewhere else when he resigned and retired. That's what usually happens after a "retirement" at a fairly young age. The coach that "retires" turns up somewhere else with a bigger paycheck. With Peterson, that hasn't happened. It seems like he really is what he says he is unless I'm missing something.