Dysfunctional Rules X: I Cast Comprehend Rules

[Biggus]

Instead, they describe what's clearly a Conjuration effect that creates a mile-wide sphere of water. (Rough sphere, depending on obstacles -- the area is a spread.) The text says "creating a tide of blackwater that spreads out ... until it fills the entire area."

It says it creates a tide. A tide is a movement, not a substance.