What We've Got Here Is Failure To Communicate. (Cool Hand Luke) ...

[Adam]

The error here is failing to award the throwin to the proper team. Definitely no way to correct this once the throwin has been completed.

Once B's throwin pass is legally touched in bounds, it can no longer be corrected.

If one of the two FTs had been shot, you can correct by pulling everyone off the lane.
If he misses the 2nd and B earns the rebound, I think it's too late to correct, then, too.

Now, if the P had given a 1 and 1, and the first was missed with B getting the rebound, that gets tricky. Failure to give the FT is a correctable error, but the throwin is not. However, I'd say give him his FT with the lane cleared and give A the throwin based on 2.10.1A.