Thank you Gil!
But I still can't quite understand."He wipes the blood from the wound on his skull ".
There is no hint about the wound on his skull. And I don't know how can it be a signal,if he wipe the blood on his skull. I think the blood itself is a signal. Or he can wave his hand as a signal.
I think maybe that 's the reason why I subconsciously think that he is using his skull as a place to show his blood on the hand...
Could you explain further how you think about this?
Interested in Language