The original Michael Myers in the 1978 film isn’t superhuman. He gets injured and incapacitated several times by a teenage girl. Getting shot six times and running away after a one story fall isn’t a superhuman feat since countless real life people have been shot multiple times (or worse) and remained conscious enough to flee. As an example Roy Benavidez sustained dozens of wounds in a firefight in Vietnam but only went unconscious after several hours of fighting and managed to live after medical treatment.