LOL HT 3 is 3 wounds. ht 4 is 4 5 is 5. 6 is 6 wounds 2 or less 0 wounds.
just for your referance
Place target enemy model within 5” of this model, then place this model within 2" of the target. The target suffers falling damage as if it had fallen from a height equal to the amount by which this model's final duel total exceeded the target's, up to a maximum of 6. If the model is killed, this model counts as having killed it.
Also what i wrote above is straight from the rule book not me