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A visibly drained Jimmy Butler got off the team bus and walked through the tunnels of American Airlines Arena feeling under the weather. As he entered the locker room on December 14 in Miami, the 25-year-old swingman showed the exhausted demeanor of a player who’s led the NBA in minutes played and miles travelled per game since October of 2013. His availability for the game against Miami should have been uncertain. But with Joakim Noah sidelined with an ankle injury, Butler would not let his already-shorthanded teammates face off against