Somatic therapy focuses on physical sensations and body responses rather than just talking. Mobilization reflex refers to the body's natural stress-response cycle that needs to complete.
I'm not a big fan of talk therapy alone or at least therapy that doesn't have a somatic or body-based component. What we need to do is create a certain sense of safety to kind of go into those buffered emotional responses and feel them all the way through and allow that mobilization reflex to complete.