When fighting Krauser, it is easier to fight him using your knife than shooting him. If you shoot him, he will usually block and counter. To avoid this, slash him three or 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.