I've never heard of anything like this before. [ flattering, though, that he hoped she'd know something. she won't forget that. or let him forget it, more to the point.

she falls into step with him as they make their way across the bridge, glancing back every so often to the swirling vortex beneath them. ]

If it is the origin of the fog, then we ought to get down there somehow to take a closer look at it. Maybe someone's put something in the water. Some sort of agent that causes the fog as a reaction? [ goodness knows there are enough foul things mixed in with the Thames river water that could react adversely if someone with the right knowledge wanted to make it happen...

not that that explains the strange pattern in their other vision. she's never seen anything like that before. ] We could at least get a sample of the water for testing. Henry might know someone who can uncover its secrets.

[ when they reach the centre of the bridge, she stops, gazing down through the thick fog at the river below. it's much easier to hear it lapping against the arches of the bridge than to see it without the aid of her other sight, but standing almost directly above it, she can feel all her hair standing on end. ]