Proton Canon.

With the three Zero Five clones in the way, Nine had no hope of shooting the giant eye. 

The purple light that washed over them performed some sort of scan, copying the abilities of the Valkyries and incorporating them into the creations. 

The new versions were able to stop Nine's bullets, and looking at the pose they took as they did so, they might even be capable of using the Force Field to its full potential.

"Five!" Zero Three shouted, igniting her propellers and spreading her wings. "Get the cannon! We will slow them down!"

The young Valkyrie was quick to deduce the right course of action. If they want to win against this Calamity they need to do so before it gets a complete reading on their abilities.