RCMP spokesman Gord Molendyk says the man had a laceration on his hand and flicked blood from his wound around the public area, on customers and on tables.
Police are asking anyone who was in the restaurant located on 58 Avenue on Saturday afternoon at about 1:30 p.m. and who may have been spattered to contact the RCMP.
Molendyk says there as some serious health concerns and those customers need to come forward.
He says the man may have been suffering from some mental-health issues.
Molendyk says police are investigating whether there's enough evidence for charges against the unnamed suspect.