This is still really cool to think about, because I never really thought of an animal actively seeking out another as prey not only as food but also for other properties like chemicals that that animal may have ingested. In this situation is seems like an edge case if it ever did happen, or just as you said a happy surprise. Though that does make me wonder if there are any other instances of this in other animals and also how often it might be un-recognized by researchers. Lots of food for thought there.