These so called ninja pullers are usually impatient and retarded DPSers that are pushing a whopping 1500dps on recount.
Ninja pullers also tend to be classes that can escape large groups of mobs, such as a fiegn death hunter or a bubble hearthing paladin inevitably killing the whole raid except for themselves. All in all ninja pullers are assholes that you should kick from your group asap!
Dude1:Man why are we all dead, I went for a smoke and came back and we've all died. I wasn't even ready!
Dude2:That fucking huntard ninja pulled and whiped us all.
My rule for ninja pullers: you pull it, you tank it.