While watching II again I noticed the landscaping in front of Michael's house. That landscaping is rather low profile and rather aesthetic. Because of that, I'm wondering where in the world the two assassins could hide until they saw Michael in the window. That hiding place would have to be from a vantage where they could see him there. Also, there was no guarantee that Michael would locate himself in line of fire. Also, why not kill him as he entered his house? Why wait? If the assassins could conceal themselves before the shooting, they could also shoot Michael with a rifle. Of course, FFC does exercise alot of directorial discretion.