Copied from the rules page: Ranged weapons cannot be used against zombies in your square when there are other players in the same square (hand to hand combat only). If you are the only player in the square with a zombie you may use a ranged weapon. Shooting INTO a space where other players are will result in the players being hit before zombies are hit. With multiple targets in a space, the order of taking damage from a successful hit with a ranged weapon will be as follows: player, walker, runner, hulk. Note that you may shoot past a space with potential targets in it without hitting anyone/thing by accident. Simply state which space you are targeting and which weapon you are using (of course ONLY a long-range weapon can do this).
I don't think you want to shoot P6, so you move first, then attack with your fists and do half a point of damage.