Accidental subdual FD death

[MrGrendel]

Had a friendly spar with another character, and one of two things happened: A summon caused bleeding, which caused the character to die, OR (possibly) his bloodfrenzy/rage wore off, causing him to die. We weren't completely sure which of the two happened, but in either case, it seemed a pretty lame death. Maybe whichever of these issues is causing death in subdual could be looked at.
 
The killed character in question was Hrugin, played by Vlaid_EFUA. There was no DM around, we waited a while. He was still able to respawn, and even be a good sport. If someone is feeling kind, I'd feel less crappy about it if he could be restored to his previous state. Just sayin'.
 
Edit: As a note, the summons did not hit him as they were being unsummoned. Since I was told they switch to FD just before being unsummoned, they were led away and manually unsummoned to make sure that did not happen.