I brought this up months ago in regards to how his shield should function. The issues I saw is that if it works like a simple barricade it won’t be a very good ability. Not only could it be easily naded but if you crouch behind it anybody could jump ADS shoot you at many ranged (especially when jumping off a wall). So it offers little protection. Also, it could be used to block doors similar to how people block areas with Kira’s ammo station. But that’s mostly just annoying and, again, not much of an ability.
I actually think the shield should work similar to an ability that is in World of Warcraft for the Deathknight class (at least it was an ability when I played) called the Anti-magic zone. How it works is you’d put up this zone that people could stand in and take reduced magical damage for a certain period of time and up to a certain amount of damage. Apply this same concept to turtle’s shield where you get a small area of protection where people can enter and take reduced damage. So instead of being something physical you hide behind (which you could probably still do) you would also take reduced damage while in the area of effect.
That would make his ability be good without making it too tall and thus having the ability to completely block doorways. Which, especially on a pub, could be a nightmare with multiple turtles trolling doors and limiting entrances constantly.
That’s my idea on how it could be useful while avoid being useless and abused. Not sure if it’s the best but it’s what I have 