The man calling Crispin's name turns out to be Bear (phew), who has been out looking for him.
Crispin explains about the attack, and he and Bear conclude that Lady Furnival must have summoned John Aycliffe to Great Wexly.
Bear takes Crispin back to the Green Man, where the Widow Daventry tells Bear that a man named John Ball has arrived. She doesn't seem too happy about it.
Bear and the Widow Daventry get Crispin settled in his room with dry clothes and a hot meal, and after sitting with Crispin for a while, Bear goes downstairs to meet with John Ball.
The fact in the fiction, John Ball is the only real person to appear in the book.