1) Other than a LOT of noise from the Department of the Enma trying to coordinate fire efforts, not much. She will notice there's more interference than usual, near the river, but there's no immediate cause to point at... for now, at least.

2) One of them will mention he thinks he saw a much larger, almost monstrous fish in the river the other day, definitely not something that you'd see near the city. At least he thinks it was a fish. He couldn't imagine it was anything else. Another mentions he swears he smelled gasoline near one of the river gates used to regulate canal flow where the ships drop off, since he'd heard gasoline was involved in some of the bombs.