Every session typically involves a healing of emotion, but I do mean something more specific by this phrase. Firstly, that this type of work occurs in what, I believe, both Herwig and I (and others) commonly refer to as the "emotional-mental body" layer of the energy body (a.k.a. "EMB" work) rather than in a location in the energy body that corresponds to a specific physical location.
But even more informative, I think, is to grok what's going on mechanically whenever emotion is healing. My understanding is this: That what we're doing is processing instances of past emotional traumas (of varying severities), that for various reasons we weren't able to process at the time the incident occurred. For self-protection, the the body opts to take on what's essentially a shock pattern, encapsulate it, and hold it until the psyche is prepared to process the corresponding emotion and be over and done with it. ―My work, RCT, and, I believe, mind-body medicine in general all say that this holding of emotion is the cause of any disconnection between our physical bodies and our energy bodies, i.e., "illness".
Also enlightening, perhaps, is to understand that trauma is interpretation. That is to say that incidents themselves are neutral, that instead it's our interpretation of occurrences that causes emotion, whether experienced in the moment or at some later time as mentioned above. The groovy thing about this is that once an emotion has been healed, we're free to interpret past and future events without the old, limiting beliefs we'd been hanging onto ―not to mention the increased flow of information for perfect structure and function to the part of the body that'd been holding the pattern. I've most definitely experienced both sides of this equation in my decade or so involved in this type of work. For one thing, the lower-frequency thoughts just don't appear nearly as often, and when they do I feel a much greater ease in recognizing them as such and not getting entangled.
Herwig, who originated the term, also specifically addresses this issue on his site.