RIP
350 hydraulic failure (I've had one) is no fun but manageable, especially by high time experienced Pilots. Jack-stall or servo-transparency is also easy to manage which only occurs at high power setting in high G maneuvers. Approaching a landing the lever would be going down, no high G's so no chance of jack-stall. Something else went profoundly wrong, some catastrophic failure leading to a lose of control. A training maneuver gone wrong is out of the question for RC.
Rest in Peace Roger & condolences to the Family