Flanker is pretty susceptible to projectiles, so why not let him parry them ultrakill style?
Firebrand
Hitting projectiles will reflect them back with slight inaccuracy
Deploys 50% faster
40% knockback on hit
Reflecting will instantly refresh your swing cooldown and negate the switch speed penalty for 2 seconds afterwards
-15% damage penalty
-20% holster speed
-50% swing speed