MONROE, Mich. The Monroe County Prosecutors Office is calling the action of a state trooper who opened fire on a knife-wielding man justifiable. Video footage showed the man rushing toward the trooper on a busy south dixie highway. What investigators say you do not see is the trooper repeatedly asking the man to drop the large knife. The encounter lasted a few seconds. Witnesses told investigators that the trooper did everything he could to diffuse the situation before firing his weapon.