Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: When Gus Poyet lost his temper and took out his anger on a cooler box — emptying dozens of drinks bottles and scattering ice on the touchline — it was in protest at so much more than Jack Rodwell’s booking for diving. The yellow was merely the tipping point which made the Uruguayan see red. Rather, there was frustration at the rapid unravelling of Sunderland’s season and his reputation. He chose to take it out on Steve Bruce, marching over to the Hull boss in apparent offering of a friendly handshake before sarcastically applauding in his face. Bruce, understandably, reacted and only the intervention of the assistant referee prevented a physical confrontation.Gus Poyet was sent to the stands during Sunderland's game with HullPoyet angrily kicked over a drinks carrierHe and Bruce had exchanged harsh words on the touchlineThe Uruguayan had sarcastically applauded a refereeing decisionCLICK HERE to read Matt Lawton's match report 
 Question:However things turned sour when B_and Poyet began a slanging match and had to be pulled apart.

Steve Bruce