Subbing after made second free throw

[BillyMac]

I got this one wrong on the 2008-09 IAABO Refresher Exam. Not exactly the same situation as the recent posts on this thread, but it still deals with whether, or not, to let a substitute enter. We were told that B-6 had to be at the table before the official stops play in order to get into the game during that dead ball.

43. A-1 has the ball out of bounds for a throw in when the timer erroneously starts the clock and runs it for two seconds. The official notices that the clock is running and stops play. As the official is at the scorers table,
B-6 reports to replace B-5. The official puts the time back on the clock and allows B-6 to enter the game. Is the official correct?
43. No Rule 5 Section 10 Art 1; Rule 3 Section 3 Art 1d