Time to make a game of this!
Oracle: "you see, the halfling's growth as a person and turning over a couple new leaves, resulted in becoming a party member who's good to work with. He and the elf in particular work together well in combat, even if they are at odds in downtime. So when the time came to fight Xykon, the pair's effectiveness in combat resulted in Xykon targeting them in particular with his strongest kill spells. Because the halfling helped draw said attention, the elf got killed in the AoE's while Belkar evasion'd his way to freedom. The elf died as a result of Belkar's competence, therefore he caused V's death."
Roy: ".....so V wouldn't have died to Xykon if Belkar had been less capable a teammate?"
Oracle: "oh no, the elf would still have died. But Belkar's drawing of Xykon's attention resulted in it being sooner than it would have been otherwise, therefore he caused V's Death."
Roy: ".....Belkar?"
Death's little helper: STAB