CCTV footage shows moment security guard knocks out man in Asda
Footage shows a grey hooded man approaching the man, who has 'security' written on the back of his jumper, at the entrance to a store in Essex before he is punched to the floor.
www.dailymail.co.uk
Dailymail has a longer clip. But what a punch. He really put him to sleep m. The man was threatening to stab people