Augustin's foul shots came after Jannero Pargo had nailed a 3-pointer with 3.4 seconds left, pulling the Bobcats within three.
Augustin ended with 28 points and Taj Gibson had 13 and seven rebounds for the Bulls, who have won four of their last five games.
Al Jefferson finished with 32 points and 13 rebounds to lead Charlotte, which dropped a second straight.
Pargo scored 15.
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