I've never used a flash-bang and I've never had one used against me. If the police ever throw a flash-bang in my house, they seriously have the wrong address. Obviously they are used to distract, disorient and confuse the "victim", it appears to be effective in many cases.
One can get pepper-sprayed and tazed for experience during the appropriate certifications. Is there normally a training situation where one is exposed to the affects of a flash-bang, if so, what does it feel like? How disoriented are you?
I experienced something like being flash-banged yesterday, it does have an affect on you. I'm glad the police have it in their "tool bag".
Yesterday morning my wife informed me that the trash compactor had a serious malfunction. For some reason the ram had gone down while the drawer was partially opened, causing a serious jam that had never happened before.
I install and repair everything around here, so when I had the chance I took it out from under the cabinet and removed the top service lid. With it unplugged I manually turned the motor and raised the ram and took the pressure off of the drawer and cleared the jam. Once it was freed, I plugged it back in and operated it through several up and down cycles to make sure it would work correctely.
At some point, and without warning, a huge loud fire ball explosion roared out of the top of the compactor while I was watching it cycle ! I instinctively moved and turned away, stayed on my feet. My wife was nearby and she jumped, and was screaming "WHAT HAPPENED", "WHAT HAPPENED"????
I was singed pretty good on my face/head, arms and had very very light 1st degree burns on my face and hand. I'm fine, the house is fine, the compactor is fine, my wife is nervous, the cat's have finally returned to the kitchen.
My point in writing about this is that I endured an unexpected sudden explosion "in my face". It is disorienting and will slow you down a bit. An unexpected shotgun blast near your face (not hitting you) may have a similar effect too. Momentarily, you ain't exactly right. I don't know how to "train" for it, I was glad to see that I kept my wits, but it does have an affect on you.
It's easy to casually sit at a computer and confirm you have a plan, it's one thing to actually experience it and review an eye-opener. I added an old thread that is similar in unexpected attack below.
I need to add how this happened. Apparently there was an aerosol can in the trash. During the up and down cycles it apparently leaked some of it's contents (that were heavier than air), they accumulated in the bottom of the compactor and a spark from the motor brushes or switches ignited the vapor. I now know how the potato feels coming out of the potato gun.