Ineffable qualities by their very nature are hard to describe, but certainly can be felt. It's in the way certain skaters performances can bring an audience to tears.
Paul definitely has ineffable qualities as well as talent and years of training and hard work that make him so wonderful to watch. It seems to me that his partnership with Piper has brought out in him a more palpable joy and enthusiasm.
We were talking about Paul's "lean and edge quality." Just teaching someone basic skills will not necessarily help them achieve the kind of lean, edge quality, grace and panache that Paul possesses, IMO.