i did a search for this and didnt find anything so if it is a repost i appologize
what happened was my servers a high pop so tagging sha can be a bitch
so how this works is your group gets tag hit it a few times leave then start inviteing other people. the bar was grey for me at first then turned red after a few min(assumeing a pally hasnt execution sentence buged it and one shot it)
but the guy got the tag left his party invited my guildy he invited the rest of us and we all got the tag as well
enjoy shareing the wealth