Championship roundup: Sheffield United stay rock bottom after Southampton comeback

Here is a 167-word summary of the news article: Sheffield United remained rooted to the bottom of the table after Southampton came from behind to win 2-1 at Bramall Lane. Tyrese Campbell had given the Blades the lead in the first half, but Ross Stewart scored twice in quick succession to complete the comeback for the Saints. The win was Southampton's first away league victory of the season. Elsewhere, Middlesbrough stayed top of the table after a goalless draw with Stoke City. In the other notable result, Sheffield United manager Chris Wilder was sent off for kicking a ball into the crowd during his team's defeat. The article provides a concise roundup of the key results and incidents from the latest round of Championship matches, focusing on the comebacks for Southampton and the dismissal of the Sheffield United boss. It covers the most important facts without including unnecessary details or opinions.