rachael bishop , 19 , was working an afternoon shift at the ice cream chain 's lynnwood store when a man wearing a baseball cap and sunglasses came in , unzipped his jacket and showed her he had a gun .
as the man reached into the till , bishop continued to chase the robber through the strip mall 's parking lot , warning people nearby that he had a gun .
as the robber fled out the door she immediately ran after that did n't stop him , she started punching him in the head multiple times .