The thing that makes less sense is that your friend's guild will probably be killing him again next week, not to mention every other enemy in that place that has already died to their hands countless times. And the fact that player characters have minuscule health pools compared to, say, faction leaders, but the leaders refuse to tank for them. And the fact that the mightiest enemies in existence will forego the insta-win strategy of killing the healers and attack the tanks just because they were taunted. Seriously, those warriors must have the wit of Oscar Wilde and the malice of... um... a very malicious person indeed. I'm guessing 'Your mother was a whore' probably wouldn't cut it.
There are many non-sensical things about WoW.