Originally Posted by Tom H.

As Tim said: Call him 'Safe' and wait for a proper Appeal. That being said, IF the runner is past the bag and then the throw arrives --- this is a continuation of the original play (the attempt to retire BR before he reaches the base) and NOT an Appeal.
Remember, an Appeal must be an "unmistakeable act" which this throw (IMHO) is not.
Now if F3 should tag the BR before he touches the bag -- or the bag while making an Appeal (Blue! he missed the Bag!) now he is out.

This IS how it is taught.

Does it happen often? Not in my experence! Usually the BR returns to the bag before anyone even thinks about an appeal.