Knockdown shields are pretty bad
Unless its a level four gold self revive shield, they're pretty much useless, people will just go around them to eliminate you instantly with the mastiff or really just any gun. Not counting the times where apparently people can stick their guns THROUGH the shield to kill you which is also pretty dumb and another reason why its not really worth it to even have it in your inventory.
They need a change to be more useful, like at the very least make them wider and curve in on the downed legend to make it harder for an enemy to get around or you could do more work and replace them with domes. They'd work in similar fashion but would have a few changes; 30% slower while dome is deployed plus an extra 2 seconds to get deployed but it'd have more health then the shield by 20 per level forcing the enemy to either finish you or go after the rest of your team if they don't want to burn through their ammo. I've brought this up before and i will again.
I'm certain most can agree to this. I'm only asking to change the shields not how the whole knockdown state works, bleed out timer stays the same, can still ping enemies and stuff but not actually get blasted in the back almost immediately after being downed.