Sunderland manager Gus Poyet was sent to the stands as his team came from behind to earn a draw at Hull City.
City boss Steve Bruce and Poyet had to be separated after a touchline argument as the Uruguayan left the pitch.
Dame N’Doye opened the scoring for Hull, back-heeling past Costel Pantilimon in the first half.
Jack Rodwell scored the equaliser, nodding in from a Patrick van Aanholt cross, with the ball also appearing to strike his hand.
The result leaves both sides still separated by a point, with Hull 15th and Sunderland 16th in the Premier League table.
The early signs suggested Sunderland would be the more likely to take home all three points, but Hull grew into the game and created the clearer chances.
However, neither side had the performance required to distance themselves from the relegation zone. Eighteenth-placed QPR are five points behind Hull, with two games in hand.
After his side had gone behind to N’Doye’s opener, scored from a Tom Huddlestone free-kick, Sunderland manager Poyet reacted with frustration to referee Mike Dean’s decision to punish Rodwell with a yellow card for simulation.
The Uruguayan was sent to the stands by Dean, but walked across to Bruce, who appeared to respond angrily and had to be restrained by an assistant referee and members of his coaching staff.
With Poyet in the stands, the Black Cats’ second-half performance was much improved, and Rodwell steered home a deserved equaliser after the introduction of van Aanholt and Ricardo Alvarez changed the game.
With Hull goalkeeper McGregor beaten, Rodwell met Van Aanholt’s cross with a headed effort that appeared to brush his own arm inches before crossing the line.
Rodwell then could have scored a winner, volleying over when well-placed, but a Sunderland win would have been harsh on Hull, who only lacked a finishing touch to their enterprising play.