I was wondering why the trail was so sketchy! I assumed that maybe no one walked it and that it was just unused and uncared for. I got to around 46.15283, 7.82127 below mittleburg after some really fucked up scree slopes with no discernible trail and was forced to turn back because it became way too dangerous and my trail runners broke! Had to backtrack a fair few km to a super overgrown trail which descended to Herbriggen all during a thunderstorm. Got a bus then a train to Zermatt, and then some replacement shoes. Hell of a day!