I think sts should kick out players from server who have been inactive in a Dungeon for more than 2-3 minutes and the one who has not hit any mob or boss in last 2-3 minutes i.e. no activity at all. This would stop people using glitches like this also this would stop leechers from ruining gameplay of people playing fairly in those hard elite maps during an event.

I have had many instances during 2x teeth event that whole party stops map in between and waste thier time due to that one guy who wants to leech and just keep standing at the start of map and come to boss when all mobs are finished. although the people in town shouldnt be kicked so that they can still stay afk there.