I'm sure this was once oficially answered, but probably long ago.
How does this feat:
"Use when you are defeated to perform 1 Melee attack. For each monster you defeat during this heroic feat, you may perform 1 additional Melee attack. Then, you are knocked out."
Interacts with this skill?:
"When you are defeated, you may inmediately move up to your speed and perform an attack with a Melee weapon. After the attack is resolved, you are knocked out."
Do note this is the H&M pack version of One Fist, not the Conversion Kit one, although the difference would be "just" the final number of attacks, I guess.
Thanks in advance .