The rhetorical question: Are your sure you want to do it like that? The statement: I wouldn't do it that way. Bold and insolent: You're doing that wrong! The Situation Still bouncing this one around in my head and it's quite the quandary. Was invited to join a trip last week where I knew only 1 out of 10 in the group (may seem unimportant but I believe it has bearing). Well into the trip we were doing some stemming (butt and feet), fairly wide canyon-like passage (borderline sketchy, for short legs) - a 25-30' penalty. The guy in front (who was also the designated trip leader) was struggling. First indication, he was failing to fully commit himself - butt too high - using the toe of his boots - very little or no bend in knees. I was toying with saying something when... he fell! It was a hard, ricocheting fall. Fortunately he was able to catch/wedge himself about 18 feet down. Adrenaline pumping, he quickly claimed to be okay, nothing felt out of place. (I'm sure he felt it good the next day, though.) So, what should I have done? I'm confident, had instruction been offered far enough in advance, it would have prevented the fall. On pickup trips, does it make a difference how well you know the individual? Should it? Say something when bad technique is first observed? (Backseat driver label) By speaking out (and especially if the accident still occurs) am I now somehow culpable? (We're talking seconds/half-seconds here.) Those with guiding experience, what are you instructed to do in similar circumstances?