I queued for a mentor roulette and got a guildhest that required all enemies be killed within a few seconds of each other to clear it, and I didn't realize it at first, having not done many guild hests by choice, but I figured it out fairly quickly. So did the rest of the party, except for the bard in the group with us. He/she would DPS a single target and kill it. I tried explaining what do do but the mobs kept dying to this player. I tried doing single word sentences to try to fill their chat box on the chance that maybe they didn't notice what I said. They kept killing. I even tried /S and /sh and /yell. They kept killing. Finally, through tremendous efforts by myself, the other DPS, and the healer we managed to do it. At the end I decided to hold my tongue on the matter, since we did manage to finish it somehow, but the bard didn't. They said something just before they left. In French.