It's been bugging me for years where I can win or lose or trade melee duels when meleeing through a barricade. I can't describe how it happens exactly but when either you or your opponent is up really close to the shield, your melee will lunge through the barricade, but not do any damage but at the same time, there's might connect. Extremely frustrating to lose to the rng of your (non charged) melee hitting or not.