The Apathetic one.
Join Date: Jun 2008
Location: Lost in the Warp
best bet is to plink him with the sniper rifle, hunker down beside some type of concealing terrain.
Also... if you let him sit up on the hill long enough, he will probably become paranoid if he doesn't see you. When he scans another side of the hill, thats when you pop up and shoot him, or you scoot forward in your ghillie suit...... well as long as you ghillie suit fits the terrain your in.