A man buying a Mother's Day gift at an Adelaide IGA armed himself with a large knife to chase an accused robber out of the store, following a violent scuffle.
The incident took place at Hackham IGA yesterday afternoon, when a man allegedly refused to pay for the goods he'd gathered.
"He was screaming, yelling, abusing all the staff," owner Baggio Wang said.
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One staff member, a 15-year-old girl, was reduced to tears.
A shopper approached the man and tried to get him to leave.
The pair wrestled, with the shopper eventually having his shirt torn off.
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He ran into the back of the store and emerged with a machete used to cut fruit, chasing the alleged robber and a friend out of the store.
Mr Wang said the shopper was "a really nice guy" who had been in to buy some Mother's Day gifts.
Police are investigating the incident.