There was a similar article on Co-optimus. The guy's mates both were higher level and both died against Belial or Azmodan. It was a hectic 2-3min battle before he plonked the finishing blow... just before he could have been taken out.
My bro and I have similar stories from our Diablo 2 days... but that was due to our PCs being too slow and chugging so much when we entered a new area and enemies would swarm us before the PC could show things properly. I was lucky to waypoint back to town but my bro wasn't. So, I did a commando run back to the new area and opened a waypoint for him. Those were the days before we got sick of pathetic loot drops and decided to hack our own sets (we didn't play online of course).
These days, he's a lvl 60 DH and I'm the one who needs his arse saved.