Also, considering Apollo went to the Underworld (which I'm guessing is separate from Hell, where demons like Lucifer, Beelzebub, and probably Mammon - the demon who made the deal with Kendra - live) I can imagine Kendra saying something like "Hey, Apollo, what was it like spending time in the afterlife?" and if someone asks why she wanted to know she'll be like "Oh I just a little curious. After all, I might find the information helpful in two years time."