That, however, is purposely discourteous versus watching a soloist wipe time and time again against an NM. If you see that someone has pulled a large group of mobs and they have things well under control, then it's best to leave them alone. Exception to this rule is if they've nuked your cleave group, then by all means I encourage retaliation. But when it's an NM that you have people waiting in line for, it's fair game. It's an odd double-standard, I agree, but at the same time it's different levels of courtesy.