seen it happen twice. one on one.
Not doubting your word. Just questioning the temperment of the Rotts.
when I was in my early twenties had friends who had both, they fought them and bet on it to settle the argument about which would win. the rotts had the advantage early on but tired much quicker than the pits, couldn't outlast them. if the rotts had got a good hold early it could have gone the other way.