Fight And Flight lets you move and aim ranged weapons with more precision. It is a Tier 1 Ranged skill that helps when you shoot while backing away from Swarmers or Freaker packs.
It is a fine second or third Tier 1 pick after Focused Shot.
On The Move and Quick Reload, for fighting while you retreat.
Walk backwards while shooting at a Horde, never stand still. This skill makes that style more accurate.