But after Michael Davies fled from the premises, the victim and a customer flagged down a passing police car and officers found him standing at the rear of the premises.
They found 64 in his rucksack along with a balaclava, an eight-inch knife and a meat cleaver.
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Hide AdThe schizophrenic admitted assaulting Muzzamil Malik on July 25 this year at a corner store at Niddrie Mains Road, in Edinburgh, and robbing him of money, when he appeared at the High Court in the city.
The judge, Lord Turnbull, deferred sentence until next month for reports.