Order the two of them to the balcony to cover you

From Create Your Own Story

The two teens dart up to the balcony. The boy gets there but the gaint red zombie grabs the girl with its arm. Bullets rain down on it from your two friends. It dosen't seem to do much but force it back a bit. You...

fire at the thing's head

or

fire at the legs

or

run away like a girl