It is hard to tell if this is bad/ ignorant language, if one engine is powered more on one side versus another and no counteracting controls employed there would be a flat turn which if not quickly corrected could lead to a fatal instability I would think and be more of a skid than a lateral motion. There needs to be more a more authoritative explanation of what really happened here that is for certain. Is this an idle baseless boast or did something (what?) happen?