One problem: Bryant was trailing Brown by a point.
With the lead quickly changing hands twice in the waning seconds Monday, Ndugba, a freshman from Boston, lost track of the score after a layup gave the Ivy League Bears the final 91-90 lead.
Ndugba, looking for a high-five from a teammate after releasing the ball into the air, was instead met with confusion. Brown players mobbed the court in celebration.
Blackmon had nine points and eight assists while committing just one turnover. His game winner came moments after Nisre Zouzoua buried a 3 to give Bryant, which plays in the Northeast Conference, a 90-89 lead with 12 seconds left.
Steven Spieth made back-to-back layups to give Brown an 89-83 lead with 2:47 to play.
Ndugba and Marcell Pettway made layups to bring Bryant (2-5) within two with 1:02 left.
Brown, which had a 43-39 lead at halftime, led 50-41 early in the second half on Corey Daugherty's 3-pointer.
Information from The Associated Press was used in this report.