A security guard for the St. Louis light rail system, MetroLink, was seen on video punching a man in the head who was lying down on a busy platform, as commuters looked on and shouted at him to stop.The video, from Friday, shows the guard wearing a black and yellow uniform standing with one foot on either side of the man who was facedown. The guard bends down to hit the man in the head several times.In the background, a person can be heard saying: 'He's not hurting you right now.'
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