According to Elias Sports (via ESPN.com), George joined Karl Malone in 1998 and Dirk Nowitzki in 2006 as the only players in the last 46 years (since 1969) to score at least 37 points in a game while staving off playoff elimination against the defending NBA champions.
Per ESPN Stats & Info, George's 21 points were the most he's ever scored in a quarter in either the regular season or playoffs. The 21 points also set a new record for most points allowed by the Heat in a single quarter of a playoff game, per ESPN.com. The previous scoring record was held by Michael Jordan, who pumped in 20 fourth-quarter points on May 26, 1997 in Game 4 of the 1997 Eastern Conference Finals between the Heat and Chicago Bulls.
After scoring just six first-half points Wednesday night, George canned 31 in the second half while making 12 of his 19 field-goal attempts. He made five of his 14 three-point attempts in the game, despite missing all four that he took in the first half.
In a night full of NBA playoff milestones, Miami's LeBron James added his own unfortunate one with a career playoff low of seven points. Per Basketball-Reference, it marked the second time in James' playoff career that he's been held to single-digit points, as he managed only eight points in Game 4 of the 2011 NBA Finals against the Dallas Mavericks.