The free move is limited to 80p, which would be exceeded by the move you describe.
It should be possible to line B up with the front of 3 by shifting D to its left, C to its right and A behind B. There may be other combinations of shifts, pivots and dropping back that would also work.
It could be argued that 3 is prevented from lining up by friends, so its move is cancelled. However, I think the bullet point for "... a column entering a gap..." applies so the enemy must conform instead.