[That look combined with her calling Naoto dull just a few seconds prior... Naoto was getting the district feeling she was being threatened here.

But she wouldn't back down at just that though.]

Actually, one can drown in as little as an inch of water. [Depending on circumstances.] There are accounts of drunken people drowning in toilets...

[Just going to give a pointed look at the water around them. Yup, significantly more water here.]