12. The Imam is not mounted while the follower is on foot, nor is the follower mounted on a different animal in the situation described by the text.
13. The follower is not in one boat while the Imam is in another boat that is not physically connected to it.
14. Under the matn's stated rule, the follower must not know that the Imam has done something the follower considers an invalidator without renewing purification — such as bleeding or vomiting under the follower's legal view.
The footnote records an important later preference: several Hanafi authorities held that the Imam's own legal view is controlling in this last issue. The course therefore presents #14 as the matn's rule together with that documented qualification.