i mean,if kakashi ms is orientated in front ,can he absorb objects from behind him,we saw when he fought with pain,kakashi absorb a roacket,without to be with his eye in the roacket direction
I don't remember showing him kamuing his hand first, but still, that is just part of his body, not his whole body, so even kamuing his hand first, he would have to see his body, which he didn't.