was just thinking actually, with previous talk of alternative lightening and vader having a pile of flashbacks upon witnessing luke's potential death,

what if the lightening arcs seem to create faces of people who have been killed across the saga, like qui gon, mace windu, padme and obi wan. theit faint screams could be heard when a hint of their lightening outline is seen, maybe climaxing with padme screaming "ANAKIN!", and as her voice fades away he chucks the old man down a hole.

(or anti-climatically decapitates him with lukes sabre.....)