[Now that he's put two and two together to figure out she was a shinobi, and from her demonstration before, he figures she really is a lot tougher than he originally thought. But that doesn't mean he'd let her fight Frieza on her own.]

A battle is a battle, and there are no rules when it comes to that. [He points a finger just for emphasis.] If you decide to face him alone, if it even comes to that, don't expect him to show you the same mercy. I know your type, you shinobi, but I'm talking about a power that could wipe you and your entire shinobi existence off the map. Sometimes it's best left for those who can rival that power than throwing your own life away just because you can't stand to sit on the sidelines. You're not going to be doing anyone any good dead.