For Deronda, terribly excited by fluctuating fears, the strokes of the oars as he watched them were divided by swift visions of events, possible and impossible, which might have brought about this issue, or this broken-off fragment of an issue, with a worse half undisclosed--if this woman apparently snatched from the waters were really Mrs. Grandcourt.

Deronda watched in fear, seeing swift visions of possible events which might have happened - if this woman apparently snatched from the waters were really Mrs. Grandcourt.
