[Ari's loyal to Nobunaga, but not blindly so, and she can see well that he, too, is currently ridiculous and with terrible timing. Not that she cares whose ass the comments might be about; it's the fact that they're being made at all, when everyone should be focused on the fight ahead of them. Ari would have known better than to act the fool during a dangerous situation by the age of fourteen. She's making no allowances.

She and Arthur are now as safe as they're going to get for the moment, but she's keeping an eye on both their immediate surroundings and the other group, staying alert to the situation.]

It's true that he has no real understanding of privacy, and I know he didn't mean to offend you... [That's as much defending as he'll get from her right now, and she tuts, irritated.] They're creating an unnecessary hazard, going on like that. [But she doesn't want to worry him unduly.] Cassandra's competent, she'll handle the situation. And there - Bastion's joining them.

[Ari knows how nervous it'd make her if she couldn't see what was happening right now, so she means to keep him informed.]