Is a batsman out when the ball naturally turned back to his stumps , but ball first landed out of his crease?
This would be out as explained in law 30 bowled
Simply put it has to touch something else on the field of play before hitting the stumps again for it to be not out bowled.
If the ball is deflected from the bat onto the fielder's helmet and then gets caught by the keeper, are they out, if the ball does not touch the ground before it is caught?
If the ball hits the arm protector that is touching the glove of the leading arm in question that is holding the bat, is the catch considered legal, and the batsman out?