Board Thread:Off Topic/@comment-25396609-20160125214134/@comment-26397825-20161024121213

There are no documented cases of Grimm willingly charging through and killing their own kind just to attack someone. We have seen cases of Grimm hovering around the edges of a group, waiting for one to fall so they can step in and take their place, however.

It may happen, but the person would have to be seriously pissing them off to make the larger Grimm charge as opposed to simply waiting around the edges for a chance to strike.