Ep 31. Person Left Behind

Ruuji is attacked by a woman called Gaball, seeking revenge for her dead lover Dinga, who was part of Ra Kan's resistance army. Ron convinces her to take out her anger in a Zoid battle - her Brastle Tiger vs Ruuji's Murasame Liger. During the battle, a group of Bio-Zoids show up and Ruuji and Gaball are pushed into a trap. Ron and Mii come to their rescue, and Murasame transforms into Hayate Liger to finish the job.