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In it, Spencer (Troian Bellisario) (looking particularly lovely in her elegant costume) is being grabbed from behind from a tall figure in one of the creepy doll-masks (and the burlap sack costume that goes with it) from last year's Halloween episode. Oh no!
Our question is: Who's in the costume? In Season 2, Episode 13: ”The First Secret” it was implied that the doll-mask wearers were potentially linked to the "A" team, so our first thought is Toby (Keegan Allen). But would he really attack Spencer? Even though he's on the "A" team, we're not convinced he would physically hurt Spence (but maybe we're just overly optimistic).
If it's not Toby, who else could it be? The figure appears to be notably taller than Spencer, which seems to rule out Mona (Janel Parrish). In The First Secret we saw that Lucas (Brendan Robinson) was wearing one of those masks, but we're pretty sure the figure in this photo is too tall to be him, too.