It was probably just some really good shit, and you made him smoke too much past his limit.
Alot of people only smoke to their limit and stop. People are saying wow 6 bowls (i've never done bowls before, im more of a J\Self Made Bong man ) which makes 6 bowls sound alot. So yer...
I used to get fucked off like 1 joint when I first started. So he probably just took too much. I wouldn't worry.
Was the smell any different? Did you feel any different?
Side note; whr do u live orangeman? so i can come smoke some of your good shit