Martin Richardson, whose bravery foiled an attempted hold-up of a betting shop in Leeds, has spoken about the incident.
CCTV video shows Azar Sulman enter the bookmakers in Burley holding what appears to be a handgun.
After threatening the cashier, he tries to leave the shop, but is blocked by Martin Richardson, who hits him twice with a chair and holds him to the ground until police arrive.
Mr Richardson told BBC reporter Chris Buckler he thought he was going to be shot, so he "hit him (the robber) twice with a chair".
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