Hannity and the rest of FOX News is afraid to address what Islam really is. You do not know for sure that Hannity knew exactly what he was going to say, and Hannity could of backed him up.
Spencer says it well.
Yes he could HAVE backed him up, but he hardly needed to IMO. He let the man speak from his experience to state that there is no such thing as moderate Islam and I saw Hannity encouraging him to do so. In this case I saw no need for the interviewer to say, "yes, I agree with that!" The video you provided does not address this specific instance IMO.