Correct or incorrect. If incorrect is this correctable?

[rawhi1]

Situation:A1 is shooting the 2nd of two free thr.ows. As a1 receives the balls for the free throw the administering official sees b1s foot across the line separating the marked lane space nearest the free thrower. The official gives the delayed singal as a1 releases the ball. A1s 2nd attempt does not hit the rim and the official gives a1 another attempt at the 2nd free throw.A1 hits the 2nd free throw and play continues with throw in by team B Was the official correct.