Thanks. The "etc." threw me off I think. After posting the question, I figured it out by looking at subsequent examples with more explanation. The Black Rook interposes at g8, leading to White Be5. They leave out the fact that the Black Rook at b3 can get involved as well and (futily) interpose.
Question from Bobby Fischer Teaches Chess
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I have a question from Bobby Fischer Teaches Chess. Would someone please explain frame 213 on page 258? What happens after White's Rook checks?