While you may not be able to quote the spoiler using the highlight-quote method, you can quote the whole post using the “Quote whole post” button in the composer, and then edit it down to what you want (you may also want to remove the , full:true part of the quote code to get the full context available in the quote, but it’s not critical). You would click the Reply button on the post you are interested in quoting, then press this button:
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