Crazy Dad Attacks Snowboarder [POLL]

Is this dad out of control, or just protecting his little boy? What would you do if your kid was run over on the slopes?

Que Go-Pro cam, teenagers snow boarding, and super angry dad- now:

(PG-13: Language)

I have no idea what the procedure is for skiing. Do you pass on the right?  Seriously, I have no idea! One thing I do know- dad and his kid seemed to be hanging in the middle of the traveling lane, no?

I can understand dad being upset, I'm a dad. When your kid gets hurt your adrenaline goes through the roof and you jump into action wanting to remedy what is hurting your little booger. But I don't know, dad seems a bit out of line. Then again, maybe these snowboarders were acting fools all day and happened to cross paths with the wrong father?