Vanessa hits Maria's car mirror with her crutch and the mirror falls to the ground. First, there was not enough force to knock the mirror off of the car. The crutch would have simply bounced off the mirror. Second and more importantly, this year, make, and model of car would have electrically adjustable mirrors. This means the mirror would have wires running into it. If knocked off the car, the mirror would hang by the wires going into it.