3 Man Mechanic FED Double Steal

[pastordoug]

Can anyone help with the responsibilities of U2 and U3 (FED) 3 Man Mechanics for a double steal, runners on 1st and 2nd? It's been suggested that U2 needs to break torwards B when R1 takes off for 2nd.... I feel that puts U2 in no man's land if R1 decides to turn back towards 1st and (if first throw goes to third which seems to be the likely throw) now there's a throw from 3rd to 1st...... Any help would be appriciated.