Guild Hest: Ward Up

Sometimes I get Mentor Roulette for this and I keep seeing people who continuously disregard the must kill all 5 at the same time. To the point where we're stuck for 30 mins because one person feels the need to troll the group. (And they are aware of it too.)

The person in question would pull the monsters to us even though we backed off at start to let them respawn. / Sprint pull to us go back/ kill one etc.
Grief Tactics etc.

I honestly wish SE would remove the ability to return in this particular Guild Hest because it's just too chaotic to deal with one person who doesn't want to win compared to others who are trying to win and frankly its a waste of our time. /sigh

Edit::
Also thanks to Gm Culgonsimigast for responding so quickly.

Yes, the problem with this one is that it's very hard to have a chance to kick a bad player (I've had something similar with one of those weird people who clearly don't have the chat log visible and don't read, very frustrating). If you could kick griefers from it properly without always being dragged into combat it would avoid the worst issue.