flashbang works on principal of overloading your senses. It actually works better if you can see better so that your eyes and brain that receives info from your retina fries easier. Also if the pilot is incapacitated, the IS is pretty much incapacitated as well since Silver Gospel is the only machine thus far that can act independent of its pilot's wishes.
The IS probably has a sun visor function but just activating it in a split second may become a distraction of half a second.
Taking the barrier into account, I thought if it was possible to create a small beacon that can attach to the barrier. It forces the shield to continuously activate as if it was taking continuous damage
