Silva, the guy that goes down, is a fucking monster that can usually just dodge blows all day while not even keeping his guard up. This time however, the winning competitor, Chris Weidman used an unusual punch combination that caught Silva off guard and managed to win him the match. This broke Silva's incredible record 16 win streak. This quote from Jack Slack goes into more detail of how Chris exploited Silva's weakness
Quote:
When fighting Silva, opponents struggle to hit him, and when they connect, he takes the power away by rolling with strikes. Rolling with a punch means to move in the same direction in order to reduce its impact. In MMA, this should be easier than in boxing because almost all MMA fighters attack by alternating their hands—left-right-left or vice versa.
Boxers often double or even triple up the same hand mid-combination, which makes it difficult for the defender to turn side to side as Silva does.Very few opponents have doubled up punches from one hand against Silva. I am not saying that doubling up would allow a fighter to knock Silva out—there isn't a simple answer to an iron chin. However, there is a reason why elite boxers rarely roll with every punch as effectively as Silva does; boxers are not as predictable and one-note in their offence.
The combination that Weidman used was left , right, right backfist, and left.