As Street is following Janet and Eric in his car, the top buttons of Street's shirt are open showing the top part of his chest. When they stop, Eric shoots Street and runs off with Janet. When the S.W.A.T. team arrives, they go directly to Street who survived thanks to a bulletproof vest which is now clearly visible from under his shirt.
The killer has a revolver with a silencer. A silencer (more accurately a suppressor) doe not work on revolver because most of the noise from firing a revolver does not come out of the barrel as with a pistol but comes from the space around the revolving cylinder.
Jim Street is to protect a girl who's boyfriends are being killed by a crazed stalker. Jim is put undercover to date the girl in hopes of drawing out the killer. Jim's picture ends up on the stalkers wall where the stalker takes shots at it. One of the shots disappears after hitting the target then reappears after the picture is shot again.