This is the horrific moment a complete stranger brutally punched a woman to the ground before casually walking away.
Footage shows the 63-year-old woman unlocking her bike from beside a road in Argentina as a man walks up behind her.
In a seemingly unprovoked attack, the male then smashes his fist into the back of her head, sending her - and her bike - flying to the ground.
As the woman sits on the floor holding the side of her head, the man continues walking along the street as if nothing has happened.
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