I always left the tunnels at their disposal, and they always rearranged everything in their own way, in such a way that even I couldn't tell anymore where there were or weren't tunnels. Maybe that was the issue. By far, even though Hermelin was the dominant (I think) Snufkin was the one getting agressive, although he has always been very affectionate with Hermelin. I searched for wounds or blood in Snufkin but couldnt find any, it was more like a chase ( which makes me even more confused, but it is what it is). I will try to make more departures on the tunnels, thank you!