SHOPPER Graham Penn was head-butted in Newton Abbot after he tackled a man suspected of running off with his bag.
The 59-year-old retired railway man suffered serious cuts and bruises after he took on the alleged thief at Sainsbury's supermarket at Penn Inn.
After the incident Graham said: "It's not what you expect on a sunny Sunday afternoon."
He praised Sainsbury's staff and a mystery 'huge bloke' who helped him hold down the man.
Graham, who is a keen Teignbridge Trotters runner from Lustleigh, had just completed a 10-mile Teign Valley run and was still wearing running shoes when he set off after the alleged bag snatcher.
Graham said: "I was with a friend coming out to the car park with two trollies.
"I turned away from my trolley for two seconds and my black plastic bag with my wallet, phone and glasses was gone.
"I still had my running shoes on and I shot off after a bloke in a black hoodie who was going into the store.
"It seemed like he was sticking something down his pants.
"I went right behind him wondering what to do and looking for security guards.
"My friend shouted 'don't let him get away'.
"I shouted to the staff 'I've just had my bag stolen. Call the security guards'. Everyone looked around.
"Then suddenly this massive bloke was coming through the doors with his wife and he helped me. Between us we got him right down on the floor. I was pouring blood everywhere after being head-butted and my friend was in tears. It was shocking for everybody who saw it.
"There were women and children who were obviously upset. It's not what you expect on a sunny Sunday afternoon.
"The lads who work in Sainsbury's and the security guards were all brilliant."
A man has been arrested in connection with the incident and bailed for further inquiries.