that your toon will run past all of the enemies it DOESN'T HAVE TO kill and will only kill those that it DOES have to.
semi-correct.
If your toon gets stuck cause enemies block the way, it technically does have to kill them to continue walking. What it actually does is, stand still doing nothing and get killed. So use this "mode" with caution.
Or get illusory boots and enjoy 2B xp
Sure if you're lucky and find them ;-)