One of the reasons that instructors are a really good idea is that they are taught movement analysis. When you take a good skier, even a really good skier and ask them to tell what another skier is doing well and doing poorly, they very often can't get beyond recognizing "backseat and hands not in front".
As a BF, don't go beyond "you're doing great", even to say you're doing XX great". Leave that to the pros.
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