By Jelani Scott Allen’s feel-good moment came 24 hours after the Bucks guard played the Bulls. View the original article to see embedded media. A free throw contest during halftime of Saturday’s Duke-UNC matchup gave Grayson Allen the chance to be the hero inside Cameron Indoor Stadium one more time. The former Blue Devil and current Bucks guard returned to his alma mater as one of 96 former players on-hand for legendary coach Mike Krzyzewski’s last game. Allen, the only active NBA player in attendance, had the pleasure of stepping up to the line as a part of a fundraising effort for Duke Chil…