The Spirit Tortoise begins its march once more, appearing at the border of the kingdom bearing its name. Naofumi volunteers to lure away its familiars while the army tries to bring it to the mountains. The Spirit Tortoise’s familiar, Ost, fights alongside the humans…
It's probably trying to 
avoid hurting itself.
إنّها تحاول غالباً أن تتجنّب أذيّة نفسها
Sie will sich womöglich
nicht selbst verletzen.
Así evita dañarse a sí mismo.
Así evita dañarse a sí mismo.
pour ne pas qu’ils la blessent.
Probabilmente per evitare di ferirsi da solo.
Provavelmente é para evitar
que se fira com os espinhos.