The Frugal Wizard's Handbook for Surviving Medieval England

A man awakens in a clearing in what appears to be medieval England with no memory of who he is, where he came from, or why he is there. Chased by a group from his own time, his sole hope for survival lies in regaining his missing memories, making allies among the locals, and perhaps even trusting their superstitious boasts. The Frugal Wizard's Handbook for Surviving Medieval England should have given him the answers he needs, except his copy exploded during transit.
The few remaining fragments provide some clues, but can he figure them out in time to survive ?