I guess the big question now is: Is it better to attack THIS turn and shoot player 1 along with the zombies, or allow them to finish off player 1 and come to us where we fight hand to hand?
If we move forward, we use up actions on moves, but shoot from a distance. If we stay, one zombie will finish off player 1 and the rest will move. The runners can reach us in 1 turn and we would be in hand to hand combat only, but with just 2 zombies, as the first will have used its turn to attack player 1.
Then again, the zombies can miss and more would need to use their turn to attack!
I think we should move to the square above the zombies and take our shots. With luck we'll already finish them off. If not, less to deal with in hand to hand. Then 2 and 4 can fall back to our position and we'll exit objective in hand.