It is recommended that you carry as many Holy Waters as possible, and refill every time you get to one Holy Water remaining. When he first appears, use the Holy Water and run for the door on Alyssa's right. You should be in a office room that has two fish tanks. Run behind the fish tank that is closes to the television screen. You will see Chopper Man enter and repeat his "Oh nice trick" phrase. When you either see or hear him vanish, the coast is clear. When he appears on the B2 floor, does run down the stairs and go all the way to Alyssa's left. There should be some barrels and fire there. Hide in there and a short intermission sequence will appear. If he appears at random in the factory, do not bother hiding in the elevator. It will not do anything, as he will still be outside the elevator waiting and you will be trapped. If you need to enter the elevator and go to either B1, B2, or B3 (whichever floor you are on) and ride the elevator up or down, then go back to the floor you were on. When doing this, he will appear on that same floor again. This will get you just enough time to do what you need to do. If Alyssa is in panic mode, you will not be able to use the elevator. It is best if you use the Lavender Water to lower her panic or try to make a run for it. When you enter the grave yard after the intermission sequence, run towards Alyssa's right. There should be a house. Once inside, go around and pass the beds. Hide behind the curtain until he is gone.