I don't know how do you come to conclusion that there was any kind of mechanical damage anywhere. There was most certainly none. The engine simply shut down, most probably because one of the many possible abort criteria happened, e.g. some of the controlled variables of engine, like pressure, flow, temperature of fluids/gases in many places, or turbopump RPM, etc. exited the permitted corridor of safety. It can be due to something as simple as a faulty sensor indicating a false reading, or the condition being too strict (both happened to SpaceX before). Then the engine was shut down, and the lower temp plume of the engine which being shut down appeared to you like 'smoke of explosion' on video.
I am in fact near certain that the engine remained mechanically fine after shutdown and nothing else exploded or was broken. They will figure this out for the next flight.
Yeah now i see from the slow-mo that the aerodynamic shell got ruptured, but it's no big deal, it's obviously not designed to handle any loads from INSIDE.
I am in fact near certain that the engine remained mechanically fine after shutdown and nothing else exploded or was broken. They will figure this out for the next flight.