The lights flicker for several reasons - demons, spirits, ghosts. Sometimes angels? So Sam could be Lucifer or he could be something else. I really don't know! LOL
If he is Sam in control, he'll probably walk if he wants Dean to have the life he's secretly wanted. or he could come back with a new mission. Who knows.
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If he is Sam in control, he'll probably walk if he wants Dean to have the life he's secretly wanted. or he could come back with a new mission. Who knows.
*sigh* Have to wait until September.