The fight came late in the first period after Capitals defenseman Dylan McIlrath made a massive hit on Vegas forward Jonas Røndbjerg. Røndbjerg has just 49 games of NHL experience, including six games this year in which he's scored three points despite 4th line ice-time.
Kolesar did not take kindly to the hit on his teammate and immediately challenged McIlrath to a fight. The Caps defenseman was quick to oblige, and he seemed to defeat Kolesar in the contest pretty handily as a series of right hooks eventually took him down.