Barbara frowned, this was going just like her trip with Harley had, doing her best to keep the other woman from doing anything too terrible while at the same time knowing that she should probably just go back to where she belonged - the Bat in her though wouldn't let her just walk away as much as she wanted to do exactly that. It didn't matter that they weren't in Gotham anymore, or that she hadn't told anyone about her alter ego, she still couldn't just leave someone like him out here on his own getting up to trouble.
The sailor didn't seem to know what he was getting himself into, and admittedly Barbara didn't really know either, she just had a gut feeling that told her this guy was bad news and that alone was enough to push her to go with him.
She pursed her lips after a moment and huffed before she followed him on to the ferry, arms crossed over her chest feeling just a little bit sulky about it as they got ready to go. "I'm only coming to make sure you don't cause too much trouble." She warned him, like he might have thought she was coming with him because that was what she actually wanted to do - when that couldn't be further from the truth.