How do you heat the rat before feeding and how hot is the rat before you offer the meal? My bet is she was getting the mouse into position to eat it and it went for a dive... But maybe the rat is too hot?? Even so, if it was I don't think the snake would even try to eat it. I personally don't feed F/T so there are more qualified people than me on the subject. But my guess is that this was a one time thing. Keep us posted if your snake keeps soaking before eating though. I'm kinda curious. Lol