Do you mean a Ninja, as in the job, was pulling Hunts or do you mean someone was sneaking *like a ninja* and pulling Hunts? Either way, unless they used some sort of exploit to gain an advantage or it can be proven that they are simply pulling just to troll other players, SE isn't going to do much about it

The reality of hunts is that no one HAS to wait for everyone to gather before engaging them. Sure it's the courteous thing to do, but I'm pretty sure as far as gameplay mechanics go, Hunts are just considered free-roaming creatures that can be claimed by anyone, regardless of who set eyes on them first.

Besides, you can't wait for everyone all the time. You could sit there 10 minutes and still get someone ranting that someone pulled early.