A different perspective...
one day i was on hib quietly farming morgif and a hunter did this to me since I was being rather slow about things...
I thought it was very impressive on his part and made the mental note to stop being lazy and bother to target the last thing and kill it.
Day or two later, I happened upon a 4 man of albs killing morgif, killed them as they were just finishing him too so I got the drop.
Now if he's on your realm it's a dick move and I think technically an appeal is valid because you had started the encounter but if you couldn't /tell him anything then I'm assuming that's not the case and it's doubtful they'd do anything at all anyway.
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Vyxar
Master Eldritch
Shadow Legacy
12,11,11,11,10,10,10,9,8,7,7,7,6,6,6,6,5 etc...
Marubaloobalah - "Mediocre people that don't know they are mediocre are like the homosexual to your hate crime."