[Beorne]

It's not "only" a matter of two "extraordinary" damage rolls.
Observig the fight very carefully, I realized that
1) the second succesful strike (the killing one) was the very first strike of that round (so, no multiple attack penalty occours to the king of flame);
2) the flagellant has a fatigue of more than 60 (-3 on the attack roll), and a "lost one eye" battle affliction (-2 attack roll). The +5 attack fire bless is balanced with the -5 from fatigue and battle affliction, and so the chance for that flagellant to hit the king of flame was less than 0.2% (Att 9 Vs Def 26).

Conclusion: the final chance to kill the king of flame was not "only" 1/6^10
(the damage rolls), but 1/6^10 * 2/10^3.

Do you really think it's possible?