Zillow MBA Strategy interview questions

I actually applied for Zillow's PM role, but got diverted internally to the strategy role. The interview process was conducted via telephone and comprised of two interviews (I am not sure if I'd have a third one in case I had continued in the process). The first one was a 20 min screening / background check interview with a recruiter. Very straightforward, why Zillow, why the position and a few background questions about my resume. The second interview was a 1h interview with the VP of strategy. Even though the recruiter told me it would be a behavioral / situation interview, it ended up been a strategic discussion about Zillow, the fundamentals of business model, the competition and opportunities for the company. I had very different expectations and ended-up very unprepared for the questions and the depth level the VP was looking for. She also sounded very serious on the phone without much of an engaging behavior. The quality of the call also made things marginally worse.