He tells of falling through the ice and being taken to a castle where he see 12 paintings. As he looks at each painting, a person comes to explain the menaing of each painting. After 90 days, through some miracle of cryonics or hibernation or some such thing, Billy's breath burst through the waver-thin ice and he returns home.
The two lions are metaphors for fear and doubt. Billy learns how to control them, and at the same time develop unshakable self-confidence.
