They accidentally pulled, and they decided (and this is the key part) 'oh crap, I didn't mean to do that/OMG I'm gonna die! etc' and they decided, to reset it. There is no issue with this. It's when a group is already actively fighting the mob, and some other person/group runs up and purposefully pulls hate, and dashes off to reset the mob, forcing the initial team to lose all their progress there is an issue...a reportable issue.
