Arrest him in a non-violent manner. I would be trained to do so.
The officer was not going to arrest the man. He was going to let him go.
It was only after the man (1) refused to leave, (2) then struggled with the officer, (3) then said he was going to go 'pee' (in the bushes), and then (4) tried to grab the cop again while the cop said "don't touch me", that the officer NON VIOLENTLY arrested him.