All conversation ceases, save a few hand gestures and misheard comments.
After climbing a short hill, your partner tires physically and you have to slow down to match his or her speed. You round a corner quickly and take a sharp turning. Your partner loses sight of you and misses the deviation. After a few minutes frantic searching you find each other again and consult the map in a lay-by. You both take the opportunity of the stop to get out a snack.