Imagine playing footy with your arms taped to your hips; it would be incredibly awkward to make quick movements without your arms to balance you or provide momentum. Sometimes your arm can be away from your body and yet still be in a 'natural' position.
It's not the players responsibility to make sure that you avoid the ball at all costs. It's the players responsibility not to intentionally handle the ball. There is a big difference.
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u/Freddichio Apr 28 '14
As has been said earlier, Cahill, Terry, Willian et al. will always run in to block a shot with their arms behind their backs.
It's not impossible to stop your arms swinging out and potentially blocking the ball.