The typical torque converter style and design dictates that the stator be prevented from rotating underneath any ailment, that's why the phrase stator. In practice, however, the stator is mounted on an overrunning clutch, which stops the stator from counter-rotating with respect for the prime mover but lets ahead rotation. https://torqueconverterclutch12333.tokka-blog.com/34237509/the-smart-trick-of-torque-converter-clutch-that-no-one-is-discussing