It's too late to react, a human has to look for clues before hand to try and predict the outcome (which is quite possible, I've for instance noticed that a pers

It's too late to react, a human has to look for clues before hand to try and predict the outcome (which is quite possible, I've for instance noticed that a person throwing a rock will often squeeze the hand noticably harder). But changing after/during the fact will be noticable.