неожиданно ударить(to punch (a person) suddenly without warning and often without apparent provocation (Merriam-Webster): Vancouver police are searching for a suspect following another downtown stranger attack. According to Cst. Jason Doucette, the incident took place as a woman was "simply walking down the sidewalk near Cambie and Pender when a man came up and sucker-punched her in the face for no reason.”castanet.netART Vancouver)
