You're right, it sucks how this triumph mechanic is set up.
With that said, you'll only get reported if you don't allow your teammates to get a shot on the ruffians. If they don't, it won't count for them, so you wasted their time at that point.
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Counterpoint: People who make it their life's goal to full the treasure haul will end up despawning the ruffian if you don't kill it instantly.
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Happens so often :(
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True, that can happen as well. It's a crapshoot lol.