Rikku turned towards Yuri's question, she seemed perfectly resolved now that she wasn't half ready to dive into the sea. "I'm heading down." The girl had a lot of experience at sea, and figured she'd be more help down belowdecks than protecting the lone moogle who could fly away from danger.

...It would also be totally spooky staying behind as a lookout with just the two of them. Gah.

With the buster gun at ready, she followed after Luffy and Yuffie. Keeping the barrel at ready for anything that might spring and attack those that lead the way.