I really liked the imagery of Ryou in the pool, enclosed in water while Yugi watched anxiously. I don't want to say this is OOC, but I haven't seen Ryou this depressed in the canon, so I expect you'll give us a plausable reason for his desire to "drown" in the next chapter when you develop the plot more.
Author's response
Thank you for keeping an open mind about this fic! Yes, it'll become more apparent in later chapters. Once again, thanks for the open mind!