thanks Rifleman for your suggestions and all
I've now fixed it and if you are close to them and they use a sniper rifle they will switch to a pistol if they have one..
and also if they're about to shoot with sniper rifle.. they will no longer shoot until they have come to a complete stop
however.. it makes them easy targets.. I couldn't find any better alternative.
that zooming problem is because of their bad sense of hearing..
right after the sound is done playing they forget about it completely..
I have not messed with their hearing too much yet because I still do not understand it..