It is by Knowing the Time to Fall - S1.E22

Aguila's reconditioning has turned Ouka into a battle machine. Her Rapieçage Fantome overwhelmes the School children. Cuervo Cero makes an attempt to revive her memories. Meanwhile something strange was happening throughout the Earth Cradle. The activated machine cells repaired the damaged enemy units, and stopped the SRX-team dead in their tracks. And above the gate of Magus, the Dygenguar and Thrudgelmir face off, ready to use their ultimate techniques