[Forksref]

The failure to award a merited FT is an error that is correctable until the ball becomes alive following the first dead ball after the incident. In other words, B threw the ball in and was advancing it. At the next whistle, the error could have been corrected. If it wasn't by that time, once the ball was thrown in again, or rebounded after a missed FT, it would have been too late. An alert table would have sounded the horn while the ball was in play, assuming it didn't interrupt a scoring chance, and the error could have been corrected.

BTW, in our school system, the "table" at a JH/MS game consists of one JH kid who usually doesn't start the clock on time, doesn't keep track of team fouls, doesn't keep track of the possession arrow and has a tough time handling just the clock and score correctly. The scorebook is kept by a kid or coach at the bench. Not a very good officiating environment.