Accidental appeal and mechanics question.

[Illini_Ref]

Bob,

Explain both FED and Pro mechanics to me here. The fielder takes the throw with his foot ON the bag and the runner beats the throw and is beyond the bag when the throw arrives but misses the base.

Do you signal safe and make them appeal, or out because the throw was taken on the base and the runner missed the base?

I assume there is a difference in mechanics between FED and Pro in this same situation.

I understand that if the fielder is off the bag you signal safe and wait for an appeal. The FED is just having a hard time deciding what type of appeal is valid. I'm just having a hard time in the above situation where the throw is taken on the bag.

Also, since a runner is assumed to have gained a base when he passes it, does that change the way continuing action is applied. Example. Runner goes crom first around second on a hit. Before he gets to third, he realizes his mistake and returns to second. The play is continuing. Does the fielder have to TAG the runner since the force was removed?