Go project IGI installed folder then goto commenai backup the folder
ai, There will some files like "civlian.qvm", "guard.qvm" like that
names of enemy's copy the file "civlian.qvm"[ctrl + c] and paste it
[ctrl + v] in that same folder, if willbe like copy of civlian.qvm
then rename enemy's files into some other names then then rename
copy of civlian.qvm into name of enemy's files like guard etc. then
start the game then enemy's willnot shout you or kill you, If thay
see you than thay will run away like civlian.