Stick Push
All I can say is WOW...what a stick push.
I've never seen one from the outside, but to me, it looks like that may be what happened.
When they made the first touchdown and the sparks flew, maybe that slowed them down so much, that when they went airborne in the bounce, the system thought it was a deep stall.
And it may have been. The right wing looks to be dropping off.
Maybe some Challenger guys here can let us know how much force it would take to over ride the pusher.
Otherwise, I would assume the only other way to over ride it would be to push the A/P disconnect? Probably happened too fast for that.