I would agree, it is probably confusing initially. It would make sense to follow the heuristics of other instant search sites. However, when I experimented with

I would agree, it is probably confusing initially. It would make sense to follow the heuristics of other instant search sites. However, when I experimented with auto updating the video it just didn't "feel" right. For some reason I think a user selection model is a better UX in this case.