Final answer:
Peter's surprising act at church that astonishes Corrie likely involves an unexpected or miraculous action, similar to the biblical event where Peter catches a fish containing a coin to pay the tax collector, showcasing his faith and the occurrence of miracles.
Step-by-step explanation:
The surprising act that Peter does at church, which astonishes Corrie, most likely refers to an episode from one of the texts provided, in which Peter performs an unexpected action that is out of the ordinary or against the character's predictable behavior. Although the exact details of what Peter does to surprise Corrie are not laid out in the references provided, we can speculate it mirrors the kind of surprising actions detailed in the references, such as catching a fish with a coin in its mouth to pay the tax collector, which was an extraordinary event and indicated Peter's faith and the miracles attributed to Jesus. Likewise, Peter may have done something that deviated from his usual actions or something miraculous that was witnessed by Corrie during a church event.