[@KoL] Eos launched plasma from her position that affected the entire facility. Artoria aimed at the source of the plasma. If all her clones are that strong too.. Okedokee. 

Also, Artoria launched her attacks downward.. from the top of the facility. If Mephila and Henry moved upwards, then that doesn't change that Artoria's attack is still headed downward, and will not break through a floor heading upward.