During the Wild Man video, Tom is talking about the National Championship match with Ness, he states that Dennis gets a take down to ice the match, and that Ness calls injury time right after the TD. Brands says that was a Minnesota Trademark (calling for injury time to give them a breather and get better position) and is why they changed the rule to give the non-injured wrestler his choice of position when the match resumes, he referred to it as the "Minnesota Rule".
Right after the take down, Dennis has Ness flat and probably could have rode him and wore him down a little, but after the time out, a well rested Ness gets to go back on all fours in the down position and is able to quickly escape.
For sure a fake injury, but he played it well and won the match.