For one thing, it was rather shabby to hide and his doing so reflected on his companion.

The feeling got stronger as Osborn went up the road, and Kit was sorry he had given way to a cowardly impulse.

Yet since he had hidden, he must wait.
After a few moments, Grace turned her head and Kit saw her face was flushed.

It was obvious that she felt much as he felt.

She had prompted him to hide, but she had done so in sudden alarm and he ought to have kept cool and thought for both, particularly since it was getting plain that Osborn was looking for them.