
We can deduce from the numbers that the result of 51 hit dice is valid with a roll of 11:
( 18 [levels] + 5 [Ch] + 2d6 [roll:11] ) * 1.5 [empowered] = 51 hit dice
So that part looks ok, however if the result were not empowered, it would have been
18 + 5 + 11 = 34
As you can see in the example above only three 9 hit dice undead were affected and the fourth was left unscathed due to hit dice.
So Taron was able to turn 27 hit dice of undead, but not 36 hit dice. This is consistent with an unempowered turn attempt, leading me to believe that the script, although reporting empowered hit dice in the log, is actually using the unempowered number when applying the turn effect.