On December 22, 2018, during the third period in a home game against the Anaheim Ducks, Jeanneret suffered an acute medical emergency and abruptly cut out of the broadcast, leaving color commentator Rob Ray and on-site studio host Brian Duff to call play-by-play for the remainder of the game. Almost immediately, fans watching the broadcast or listening to the game took to the Sabres' Twitter page, expressing worry and concern for Jeanneret and asking for updates. Eyewitnesses noticed Jeanneret being escorted out of the arena on a stretcher. Buffalo News sports commentator Mike Harrington, who was at the game, tweeted about seeing the situation unfold, prompting hundreds of further tweets from fans at the Sabres' page. Jeanneret had shown no signs of illness immediately prior to the game. In an interview the next day, Jeanneret, who was still recovering in the hospital, noted that the emergency was not heart-related and that he had overheated prior to losing consciousness (something that he noted was unusual since the arena is usually cold, although Jeanneret had worn a Santa Claus suit for an extended portion of the evening); he did not miss any more of his scheduled play-by-play duties.