I was in deep thought about this upcoming issue, as more people discover this tactic. Every thought about balancing this ability truly only broke the spirit of the ability. No shield in air? Takes away the mobility. Reduced damage? Takes away the strength it's used for. Shorter duration? Duration is fine now. No Nerf really truly fixed it, so the conclusion I came up with was: Buff armor piercing rounds to over-penetrate walls, jugg shield, and guardians. This brings back wall banging, allows for the armor piercing perk to be viable again, punishes stacks of players, increases flinch against snipers, and will counter the jugg shield. This balance will increase perk diversity and weapon diversity, overall it not only fixes juggernaut but also substantial issues in the ongoing meta.