How about a way that two team members can challenge one another to determine strengths without having to leave the group and un-mob each other. My thought is that it could work like the boss war or gang war where you could challenge another player within your group and the other player would have the option to accept or decline. If accepted each would get one hit on each other and the results would be displayed just like when you hit someone except it would display both sides (offense and defense).
Thank you for letting us know about your suggestion & feedback - duly noted.
We will surely look into the possibilities of implementing it.