How can you have 3 outs when all three runners left early? One of them had to leave early first.
I say you have "Dead Ball" and one runner out (whom ever left early first) no pitch and all other runners return to last base occupied at TOP.
Please site LL rule that states you can have three out as is described in the OP.
Also, where did the umpire "have" his rule book at the field during the game?