There’s no question: players don’t know the rules very well.
What do you see in this video?
What responsibility does the umpire have to “protect” base runners? Should he have called ‘Time’ to keep R3 from walking off the bag? Do you like the mechanic that U3 used in pointing at the runners?
Was the runner out of the baseline? Would that have changed this play?
Is there anything else in this play that you would change?