Originally Posted by stoffe -mkb-
If I kill him in that match, without him fighting back, it is treated as a Murder, despite it being in a deathmatch in an arena made for deathmatches. However if I attempt to spare him and abort the match I am unable to exit the arena, since the door says I must slay my opponent first.
Do you mean it appears as a murder in the stats sheet or do you get a bounty as well? I don't know about the stats sheet but I didn't get any bounty for killing him. NPCs won't treat it as a murder.
They'll recognize you as the arena champion who has defeated the Gray Prince.