He did see your face, so he knows who he's looking for, but if he's got a notion of what you look like, maybe you can use that to your advantage. You grab a magic marker from your car and head to the nearest mirror, which happens to be a reeking gas station toilet about a mile up the road. Looking in the mirror, you carefully oultine a handlebar moustache. He won't be looking for a person with a moustache! You finish and walk out of the bathroom, only to find the man there waiting for you with a pistol in his hand.
"I'm sorry," he says to you as you come out, "I thought you were somebody else."
What had been a look of horror transforms into one of relief. "It's alright," you say, "guess I have one of those face."
"Joking," the man says, lifting the gun to you. Your face changes back. "I'm not completely stupid," he says before he blasts a hole through your head.