How can you tell who reset the mob?

The other day in Mor Dhona I found the Leech King while I was randomly on my way to do something else. Told my LS, no one was on/not interested so I do a shout with the coordinates. A min later, in the distance I see the hoarde blazing towards me, so I claim the mob so I can get full credit solo because I was qued for a duty. Hoarde shows up and immediately the mob gets reset and then zerged down in a matter of seconds. I get 1 seal.... I just don't see how that is fair. I followed the "rules" and still got screwed. I guess I will just have to join a hunt LS if I want to do this content. If anyone has an opening on Excalibur I would love an invite.