Arresting the guy is fine, he was in an airport without authorisation. However, there is a big difference between informing a non-resisting person they are under arrest and leading them to the car, and throwing that person on the floor, putting a knee in their spine, screaming their rights into the back of their head and then having to go for a discreet wank afterwards to calm down.

I wonder which technique was deployed here? (The article actually doesn't give it away, but I'd be willing to bet...)