i could not find a plugin that does this
in cs 1.6, instead of flashbang turning the screen white, the flashbang makes all players disappear then slowly fade the players back in. while flash, you can still hear all players sound. if flashbang lands behind the player, then players are only half visible.
basically, flashbang effect without turning the screen white.
this is plugin that does the opposite and is not what i want
http://forums.alliedmods.net/showthread.php?t=15585