Let this serve as notice that all three ABC Thursday dramas are making their midseason returns tonight: Grey’s Anatomy at 8 p.m. ET, Scandal at 9 ET, and How to Get Away with Murder at 10 ET. But I point out Grey’s Anatomy, in particular, because this is an unusually dramatic episode even for this show – and because it marks the TV directorial debut of Denzel Washington. It’s a fitting debut, too, because his career was launched on a TV medical show, way back in the early 1980s, when he played a Boston medical resident on NBC’s St. Elsewhere.