Strange behaviour in Switzerland

A very strange thing happened to me and my friends last night in Visp area. I and my two other friends were standing and chatting under our apartment building at around 10:30pm. My neighbour in the same building came drunk and started misbehaving with one of my friend. He had a kitchen knife too which he took out and threatened. He was speaking in local German which we could not understand very well but sounded like he was asking if my friend was Michel. Later he used his knife to damage an unknown electric scooter standing near the building. We started walking away as we thought it was dangerous to be around. He came behind and misbehaved with me started shouting go away in German. One fellow was accompanying him and trying to stop him from creating nonsense. We walked away and saw him going inside the building with his fellow friend, may be to his apartment. Actually I do not know in which apartment he lives in. This happened first time with me in the last one and half year of my stay and I am thinking what to do? Should I ignore this as first event or escalate it to my apartment owner? I am also worried he should not create more problems for us in future if I escalate. I never had any conversation with him before but he always looked very non receptive from the beginning. He never greets like other neighbours. I and my friends are from India and I am living in the same building from last one and half year.