This Theory Could Explain Exactly Why It Seems So Hard To Kill Michael Myers In ‘Halloween’
From a young age he demonstrates a cold blooded desire to kill (family!! One of the things that makes him so creepy is that he seems to be invincible. Once Michael sets his sights on you, its pretty much game over. They arent something that would get in the way of him continuing to attack Laurie. This loss of vision makes him go down until he can adjust. Remember that downstairs Laurie also injured him with a knitting needle....