monk internal wound debuff/buff?

as the skill explains, monk guillotine fist will increase if opponents got internal wound debuff, but recently there is something strange about it.

when i tried dueling with my friend who is also monk player, he gives me internal wound debuff and then magically a guillotine fist shortcut popped up. what's the meaning of this? is internal wound supposed to be buff skill like assassin's shadow mark or this is just misplaced things that dev never taken care of?

here's the screen shot

notice my character was on internal wound state, and G.fist shortcut appeared