I always point to the spot. If A has it unders A's basket I tell them 'spot'. After a timeout or delay I will tell them they can run the baseline if that is the case.
I've had a 'run the baseline' throw-in that was knocked OOB in half a second by the defense. A called a timeout and when they came back, they had forgotten that the ball had been knocked OOB. I told them spot and they didn't believe me. I exlained what had previously occurred and we got along fine after that.
