Maybe, or maybe through the shooter as well. If someone is close enough to punch holes with a handgun they are close enough to get an accurate description of the shooter and the vehicle, whether they are armed or unarmed. I'm beginning to think that this shooter may not be using a vehicle at all. Maybe he just sits around and waits till a vehicle is ready to leave the general vicinity and then shoots, using the leaving vehicle to as diversiion throw off people observing him walking away (or being part of the crowd around the victim).
He'd have to know exactly when that vehicle's going to depart. Not an easy thing to judge.