This contains full spoilers for the 2018 Halloween.
In the original Halloween II there was an elaborate, soap opera-y reason for Michael Myers to come after Laurie Strode yet again – she was his secret sister, and just as he had killed Judith, he wanted to kill Laurie. This kind of explanation was needed to franchise the characters; if you were going to have Laurie and Michael face off again and again you needed to have a reason. As John McClane once wondered, “How can the same shit happen to the same guy twice?” The answer, for decades, was that Michael Myers cared deeply about Laurie.
What Halloween 2018 asks is… what if he didn’t? What if Michael Myers did not care about Laurie Strode at all, but rather Laurie Strode cared so much about Michael Myers that she couldn’t let him go, couldn’t leave him behind, and as such she ends up in the middle of his 40th anniversary prison break, once again being stalked by The Shape who, in other circumstances, would have been happy to just keep killing strangers.