GMs these days. Completely clueless.
NONE of those Turtles can be tamed by a lvl 30-40 hunter. Goda's Shell Spin ability DOES knock people back, personal experience. Finally, Turtle pets do NOT keep ANY of their abilities when tamed, and instead are given a set of "hunter turtle-pet" abilities.
So yea. Hunter found an exploit and is using said exploit. Hunter will probs get banned and exploit fixed. GM is clueless. How the hell does blizzard break so many things with a single new patch?