Он стоял довольно далеко от них и,

Он стоял довольно далеко от них и, возможно, не слышал их слов.

Результаты (английский) 1:

He stood quite far from them and may not have heard their words.

Результаты (английский) 2:

He was pretty far away and could not hear their words.

Результаты (английский) 3:

he was quite far away from them, and might not have heard these words.