There is an NCAA case ruling which says to stop play and readminister the throw-in. The NFHS doesn't have such a ruling, but does have a very similar one for a FT.
I'm of the opinion that if the player screws up and loses the ball after having clear control, then that is his fault and he doesn't deserve another chance.
I would allow play to continue in case (a), but call a throw-in violation in case (b).
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