Will FlashBangs cause an effected player to become both deaf and blind (temporarily)?
Yes, in Navy Seals when you are effected by a FlashBang, you get a high pitched ringing noise, and your screen goes white. Of course, depending on the direction you are facing, and the distance you are away from it. If the Flashbang is in your viewable area when it goes off, you get a nasty blind spot. Obstructing your view in an area for a while after the total blindness wears off.