Several times throughout the movie, Michael's eyes are clearly visible in close up through his mask. At the film's climax, Laurie shoots Michael's eyes out.
Why are Michael's kills more violent in this film? Well, he got stabbed in the neck with a knitting needle, got poked in the eye with a hanger, got stabbed with his own knife, got shot SIX times with a revolver, and fell of a balcony. Also, he's probably tired from chasing Laurie. So frankly, he's a little pissed.
Building off what was previously established above, due to Michael being played by a different actor in this movie, his movements are noticeably stiffer and much slower compared to how he moved in the first film. That’s because he previously just had his neck and eye punctured by Laurie, and was shot six times and fell off a balcony. He’s still trying to recover from the injuries he endured just a couple hours ago and is probably still in pain.
How was Michael able to see in subsequent sequels if his eyes were shot out? Simple, Laurie didn’t shoot him in the eyes. If you look closely after he moves his hand away from his face, you can see his eyes are perfectly intact. She shot above the eyes.
