The 43-year-old stands accused of murdering Scott Bury on King Street in January 2018.
The jury heard today that after meeting at a Cash Converters, the men got into a fight about what kinds of guns Nazis used during World War II.
They went to Mr Bury's home to search for the answer on a computer.
Mr Frank told his associate, "shut up, you're a miserable bitch".
The remarks reportedly provoked Mr Bury to pick up two knives and poke Mr Frank in the chest.
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