IATA and I don't care

Was doing "A final blow" in Felwood last night with an impromptu group. While we were clearing to Feldman there was a solo enemy hunter also running in that direction. We ran past them and into the room with the boss. The mage sheeped him and we killed the succubi. Just as the second succubus died, the solo hunter tagged the boss and then we killed him. Because this quest requires all 3 kills all of us were in the same boat and had to wait for the respawn.

This hunter kept placing traps right where Feldman spawns, even though they had already gotten that kill, which annoyed me but I just sat there spamming my macro. After what seemed like forever, Feldman spawned by himself and we got the tag and completed our quest. My group was starting to leave, but I stayed and kept spamming a targeting macro for one of the succubi. When they spawned I got the tag on one of them, making the hunter to have to wait for another respawn.

Why would I do this? Well usually I'd say tagging a boss is fair game, but in this specific case where you need 3 that all spawn at once, and we had already engaged them stealing the one tag just wasted my whole groups time, as they had to wait anyway. I see it as making them waste as much time as we had to waste.