"There!" Fred shouts, pointing to a cluster of trees ahead. More trees means more cover, and it'll be more difficult for him to get a clear shot at any one of them.

When they get further away, they can worry about covering their tracks; doubling backwards to confuse the trail, making false trails. Though, just running isn't likely to help the situation all that much at all.

Somehow, they're going to have to slow him down.