A moment of wonder. The man leaps and jumps and praises God. He'd been given a miraculous gift that he would have thought so impossible it was laughable. That God could do this. That is the question, then as now.
Wonder is in the eyes of the beholder.
In part it comes from what we expect and anticipate. Peter, in contrast to the witnesses, was quite matter of fact about what had just happened. If we don't, then that intervention of God may happen unnoticed. Moments of wonder, which could be lost if we aren't looking for God in the midst of them. We need to anticipate God's presence if we hope to notice His touch.