It is California and no good deed goes unpunished. From SFGate -
"A man credited with stopping a robbery of a Starbucks in July might now be sued by the suspect, over wounds the would-be robber received from the Good Samaritan.
Ryan Flores, 30, is facing charges for second-degree robbery and assault with a deadly weapon, stemming from a robbery of a Fresno Starbucks. Flores was arrested after he allegedly tried to rob a barista with a fake gun and wearing a Transformers mask — and in the process, he was subdued by a customer and stabbed with his own knife."
Suspect in Starbucks robbery may sue man who stopped him - SFGate
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