When taking on Krauser, it is easier to fight him using your knife rather than shooting him. If you shoot him, he will usually block and counter-attack. Avoid this by slashing him three to four times. He will then either kneel or flinch. When he does this, take out your strongest weapon and shoot him. If you are low on bullets, you can use grenades and mines. If you are playing Separate Ways, it is easier to use your knife the entire time.