Stefan had done the problem before when joining the rest of us as we where even struggling to get halfway up the wall. But as karma will prove there is little success to be found in hubris; Stefan slipped off at the top after laughing his way through the crux, assured he would make the ascent without even using his muscles.
What’s the lesson here? Don’t be too sure, but don’t mistrust your own ability; find the balance between the two! But mostly, have fun 🙂