Well, given what happened with Lisa, Sam could very reasonably think that even retired from hunting he needed to take some precautions and warn any person he was involved with about what was out there. As I recall, there was a spoiler that Amelia was initially very wary of Sam; that could come out of Sam telling her about the supernatural. Or, of course, something supernatural could happen after the dog encounter to get them together, or the tragedy in her life could have been supernatural even if Sam wasn't involved in it.
Re: CC Press video interviews--SPOILERS
Well, given what happened with Lisa, Sam could very reasonably think that even retired from hunting he needed to take some precautions and warn any person he was involved with about what was out there. As I recall, there was a spoiler that Amelia was initially very wary of Sam; that could come out of Sam telling her about the supernatural. Or, of course, something supernatural could happen after the dog encounter to get them together, or the tragedy in her life could have been supernatural even if Sam wasn't involved in it.