Comments have driven me to explore the "scribble figure" and I just found him. Close-up studies of the arm touching Toby reveal that the text says "They say curiosity kills the cat." Furthermore, the scribble figure is made up of words in every panel he appears in, we just can't read them.
I speculate that a being made of words in a comic strip potentially has the power to possess beings, or at least affect them. I find it no accident that immediately after the scribble figure touches Toby, he asks a curious question. I also find it no accident that the position of the scribble figure (that no one sees, by the way, which we know because Sarah is insanely protective of her little brother) is exactly the same as the position Jareth stands in just before Toby slices him up.
Ok that scribble figure is getting on my nerves! I mean we saw him when the guys were on vacation and he or it obviously gives everyone the creeps! Ecery nerve on my body is screaming that this weirdo is bad news! Can no one else see him?! I mean he's on the bench then coming towards them and then he touches Toby! How do we know that this guy isn't responsible for Jareth's accident? For all we know he could be influencing Toby and gave him the strength to wield the sword. No normal little boy would've been able to do that so something must have been helping him! I hope you explain this soon! I'm already mad and off my rocker but this is pushing it!
More potential subtext, depending on personal interpretation. Shippers could, if they wanted, run with it in their direction. Non-shippers can take it as Thranduil's reluctance to support any kind of association with the dwarves. 'Sup to you, really.