There's Goliath, a trained warrior, nurtured from birth, one of the noble elite, with a king's ransom's worth of armour on his back, armed with a spear and shield. A Rune Lord of his cult, Battle Champion, probably spelled up to his teeth.
Then this little pipsqueak comes along and challenges him.
First round, critical to the head with a sling shot - 1D8+1D2 damage, maximum rolled, so 10 direct and Goliath falls dead to the ground. No Hero Points/Fate Points to spend.
One thing is true, it wouldn't have happened that way with D&D! You need a game like RQ/BRP to do this.