Combust with unarmed attack

Hey,

I actually tried to play the infernal cry who give the buff combust on your next melee attack.
I use the warcry with an hollow palm infernal blow.
The cry go but no one of my attacks are exerted(the count of attack on the cry never change) when i check the list of weapons available there is unarmed attacks (One Hand Swords, Thrusting One Hand Swords, One Hand Axes, One Hand Maces, Staves, Two Hand Swords, Two Hand Axes, Two Hand Maces, Sceptres, Unarmed, Warstaves)
I don't know if that is a bug or just the tooltip for the weapons available with combust is just not correct but at least there is something strange here.
I didn't try with face breakers but i think that will be the same result .

this can be caused be various reasons (Multistrike, channeling skills..). With your characters being hidden in your profile it is hard to tell what you are doing wrong.