Commandos 3: Destination Berlin/Eliminate the Sniper

Stalingrad Mission 1: Eliminate the Sniper
(the pictures referred to below are broken)

Your Sniper starts at point (A). Immediately, crawl/walk/run him to point (B). This will cause the enemy sniper to move to another corner of his building (if this doesn't happen, crawl the area around point (B) until it happens). Once the enemy sniper starts moving (or after he has moved), run to point (C) and enter the door. Don't worry, your man won't get shot (the window of exposure is too small). Then, inside the building, move up to the second storey and look through the rightmost window, indicated by (D). Rotate the game camera so that you can see the enemy sniper. Shoot to kill!