They fell silent.
Julia bit her lip, nipping it into redness with her white, even teeth. I guess I'm not much of a conversationalist, she thought. For a moment she felt tiny and afraid.
Dispiritedly she searched in her sandwich bag for an apple. She brought it out and regarded it intently.
"You want half?"
"No, thanks."
She found a pen knife in her hand bag and began to peel the apple, wrinkling her forehead in concentration.
The bus was in a state supervised section of the highway. It hit a chuck hole, and the pen knife slipped, slicing deeply into her finger. Annoyed and embarrassed, she watched the blood well up in the cut. She put the apple in her lap. "Oh, dear...." She held the finger away from her.
William bent forward. "Euuuu," he said sympathetically. "Here...." He reached for his handkerchief. But before the hand got to it, he reconsidered, perhaps remembering that handkerchiefs are unsanitary. "Euuuu," he said again, shuddering. He moved his hands helplessly and stared at the blood trickling from the finger onto the floor. "Euuuu."
Julia decided: No, he certainly won't do.