I heard you telling Gary Miller about the eel when it bit you Simon, can’t say that I have ever been bitten by one myself though. They will clamp on a disgorger occasionally though and are hard to shift.
As for foulhooking, I don’t think that many are foulhooked at all. I have seen them twisting themselves up in the line and as they twist, the hook is pulled from their mouths and then sticks in somewhere else. I have also seen them trying to break the line with their tails as I have reeled them in. They take 2 or 3 hard swipes at the line. Sometimes they do break the line and people say they have been bitten off. When they take a swipe like that the hook could pull and end up in their tails.