With TTK coming out and new perk options for Ghosts and Class Items, it got me to thinking about a defensive perk option. The way it would work is certain items would give you a defensive option on LB instead of grenades. Maybe an over shield that lasts a couple seconds or a personal bubble that only lasts a second or two. Just enough time to escape, evade, or counter an attack. Then it would have a recharge timer much like grenades before it could be used again. I'm sure we have all been running from a Warlock Axion Bolt, watched our health slowly disappear after a Thorn hit, or even saw the blink shotgun coming and wanted another way to counter. Thoughts?