Serious bump steer
Too much front suspension travel and tie rod angles are too severe. Supposed to be as parallel with the ground as possible.
Hard to tell for sure but also looks like he may have some rear wheel hop/instability going on, thing is squirrely before it comes down. Watch the second video from behind the car.
http://www.youtube.com/watch?feature=endscreen&NR=1&v=4-w-tGU0Nks