We are playing Rise of the RunelordsRise of the Runelords, and were fighting Nualia and her minions in Thisletop. During the heat of the battle, Nualia was near death at just 12 HP. Her minion caster fire balledfireballed the party that surrounded her. Party survivesThe party survived via making the save or simply soaking the damage. The fire ball killsfireball killed Nualia, and the party killskilled the rest of the minions.
When it came to tallying the EXPXP, the GM rationalized that since party did not deliver the killing blow to Nualia that, we do not recievereceive XP for her demise, - but we get the EXP killXP for killing the remaingremaining minions.
Can the GM do this, and is it legal?