The spike in comments in the middle was due to the controversial call in the Northwestern/Gonzaga call where a player from Gonzaga stuck his hand through the basket to block a shot in a 5 point game. The refs did not call it, and so the NW coach stormed the field, getting a technical and effectively losing the game for NW.
NCAA statement:
With 4:57 remaining in this evening’s second-round game between Gonzaga and Northwestern, the officials missed a rules violation when a Gonzaga defender put his arm through the rim to block a shot. Rule 9, Section 15 of the NCAA Men’s Basketball Rules Book covers Basket Interference and Goaltending. Article 2.a.3 states that basket interference occurs when a player reaches through the basket from below and touches the ball before it enters the cylinder. Replays showed the Gonzaga defender violated this rule, which should have resulted in a scored basket by Northwestern.
Subsequently, with 4:54 remaining in the game and based on bench decorum rules outlined in the rules book, a technical foul was assessed to Northwestern head coach Chris Collins for coming on to the floor to argue the non-call while the ball was in play.