I'm not sure why I'm posting this- it has no real point except that I feel like sharing it, perhaps from a sense of self-satisfaction, or perhaps because I like saying "Hey, look at me! I like doing nice things!"
Anyway, last night I was farming that last bit of reputation in Silithus, when I saw a Gnome mage summon a Templar nearby. Something went rather badly for the Gnome, and I could see that he was losing health faster than the mob. My pet just finished off the Geolord I had pulled, so I ran over to the Gnome and bandaged him while I sicced my pet on the mob. Unfortunately, the bandaging was interrupted (I assume by an AoE the Templar did), and the Gnome died. The Templar was at a quarter of its health, and I fired away at it. It died without too much effort, thanks to the Gnome's earlier effort, and I ran up and looted it. I got an Abyssal Crest and four cores of elements.
This was great- I already had two crests, and one more meant that I could turn them in for 50 rep! However, after thinking about it, I ran back to the mage, who had resurrected, and opened a trade window. I passed on the crest and cores to the mage, who did a /bow and about three /thanks. I just whispered him, "You did most of the work- I didn't want to see you do all that for naught".
Ironically, he would later save me when I'd unwittingly managed to aggro five Twilight Cultists, although I think that might have been either a glitch or a deliberate act by someone else, as the four adds had been nowhere in sight when I pulled the original cultist, nor were they around for the first several seconds of the battle. They seemed to sprint towards me from the other side of the camp.
Anyway, being a nice guy sometimes pays off.