[Rules] Bombardment Chart - Example

[treadasaurusrex]

An X has to give the stack a step loss, not each unit in the stack... otherwise whats the point of the 3X results on the DF table? To move each unit in the stack to negative 1 step?

In your DF example, it would be up the player taking the hit. A 3-stack could lose one step a piece if that is how the owning player wished to distribute the 3X step DF table loss to appropriate units.