The motel room was being investigated by agents. There was a strange film, almost like a liquid cling-film over the glass on the door. It was solidifying, and becoming stronger. One of the agents had an elemental name, though I can't remember it now. I do remember thinking that they may have a connection to Sapphire and Steel, the old series from the 80's.
There was a couple on the floor, kissing, but covered in blood and the agents seemed to be ignoring them. There was a girl in the corner with a guitar, and she knew she had to get away. There was something wrong with the agents. The couple stopped what they were doing, and made for the exit.
Next thing I remember, was out in the parking lot, and the trio were about to make their escape. The agents were trapped in the motel room, the film on the door solidified harder than diamond. The girl threw her guitar, a bass, into the nearby trash and hopped onto the back of a motorcycle-sidecar.