That's a wise decision. He has a hammer and she has a gun. Getting behind her makes the most sense as she pops off a shot.
MISS.
"FUCK!" she guts out.
It's dark up here and rainy so her aim isn't as crystal as usual. "Shine the flashlight at 'em." She gestures to the one she's shoved in her back pocket or he can use his own. "I can hardly see..." and they're not going to wait for sun up to make this any easier.
"TEAGAN!" she hears Pinky yelling then there's more gun fire. This gets the zombies attention and they look back at the source of the noise. It's a fight between the distraction and the meat. The smell of dinner wins over and they continue coming toward the two of them.
"THE ROOF!" She screams back, hoping her friend can hear.
She fires when she has enough light to see. Holes being punched and brains blowing out through the back. The ammo she has isn't enough to get all of them.
Pinky's on his way though. They just have to hold out for a minute more.