When he was riding away "looking pumped" its because he pretty much just shat his pants.
I agree it looks like hes an idiot but... imagine this, your heading up the lift, you see that sick jump, everything looks fine, no groomer in sight, he decides to duck the rope. Ya it wasn't the smartest thing but if your grooming the landing of the jump shouldn't you block off the lip or have a spotter? The park was closed for a private shoot, my friend knows all the guys filming and thought it was no big deal. Obviously looking back things might be different, but hindsight is 20/20. It's easy for people to judge the situation from a 20 second clip but always remember there might be and probably is more to the story.