If you open the extension, and stand on the town, Nietzsche will appear next to it and be under your control from the start of the battle. Otherwise, you will not get her until clearing BF6. Otherwise, there's not much of note here. Either steal Ortega's item immediately, or go into battle with a huge advantage over him, because his item causes him to automatically win a skirmish if it's him against a single opposing unit (i.e, just the head). Step on the town Ortega was on finish the battle.