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.
To give FFC his due: Michael might have been bodyguarded or have been with others when he entered his home. But the shooters knew it'd be only Kay and him in the bedroom.
Your point about the foliage is well taken. It looked as if the shooters were using submachine guns. They're called that because they fire "submilitary" rounds--handgun ammo, for use in close-in fighting. They'd have to have been pretty close (>75 yards) to score a hit.
