So, my hardy band of fools had just entered Baldur's Gate and completed the thief guild quests. Having stolen the components for the Halruuan flying ship, I delivered them safely whereupon the mage chappy turns on me. This always happens, as far as I know - he doesn't want witnesses, after all. If you did Narlen Darkwalk's quests beforehand, he then comes over and kills the mage chap for you and everything is fine.
Unless you have a party that is 50% archers, that is... As soon as the mage red-circled, Coran, Imoen and Kivan went PEW PEW PEW and down he went before Narlen can even move.
Up pops Biff, and only then does Narlen saunter over and deliver his lines. He didn't backstab Biff though - the hapless understudy just stood there for a bit. I guess dying horribly wasn't in his contract.

Anyone else got any Biff tales?