There is no connection to water. He simply sat down on the grass and fell asleep. There is no key event indicating a Naga block. Conclusion: it's just a regular sleep spell – a Queen block.
Elizer Yudkovsky, "HP and the Methods of Rationality".
Мой ник транслитерируется по-разному, но я предпочитаю варианты Оот и Ооот.