for a deag, your going to want to kill him under 3 shots and aiming at the head to the best way to do it is ether stand still or you can strafe back and forth and every time you switch direction strafing, your gonna want to get at least a got in the chest "if better the head". For long distance crouch and take your time shooting on his neck with the bottom half of your cross hair. If your close range and hes spraying at you and theres to corners to hide around, just full out charge him aiming kinda low and thinking when and were you shoot him. For corners just strafe around it and if your good, go for 1 shot deag to the face. I hope this helps