Mr.Morton would of course think that it had been planned, whereas by Mary herself it had been altogether unexpected.

Kate, when the bridge was free, rushed over it and whispered something to Larry.

The meeting had indeed been planned between her and Dolly and the lover, and this special walk had been taken at the request of the two younger girls.
Morton stood stock still, as though he expected that Twentyman would pass by.

Larry hurried over the bridge, feeling sure that the meeting with Morton had been accidental and thinking that he would pass on towards the house.
Larry was not at all ashamed of his purpose, nor was he inclined to give way and pass on.

He came up boldly to his love, and shook hands with her with a pleasant smile.