It's getting aggravating to hope that the randos have common sense enough to not score when around 80 - 90% so that we can actually kill the ruffian. Either change it so the ruffian stops scoring while it's alive or remove the triumph from the seal.
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Lfg "Ruffians farm". It is a bad solution, but works. Then, as a fireteam (and not matchmaked blueberries) you can play slow and progress after the ruffian(s) spawn. Still, it's a very dumb way to play against the game to get the objective on the triumph.