he is a noob, over leaned the bike.Why'd that guy go down? did he panic and let go of the bike or was he at the lean limit?
I think the oncoming guys got surprised by the Cam guy and the rider infront.
You can see the first oncoming rider straighten up a bit when he sees the 2 riders...the guy behind must have upset the bike by getting on the brakes and/or chopping the throttle.