You´d be amazed at how big a prey they can try to eat (the fact that they can´t eat it doesn´t mean they can´t try).
Also, there´s the frequently ignored issue of illnesses. In your case, probably nothing happened, but when you first mixed them there was a risk of introducing pathogens and parasites.
Anyway it´s prefectly clear that you have your mind made up. I just hope you realize that this situations get this kind of answers because people are actually worried....it´s not just an attack, it´s genuine worry about a less than ideal situation.
I hope you never have any problem!