The act itself would be simple for me, of course. I could break that boy's neck with one hand if I wanted to. But I wouldn't need any of the rest of it and dragging him up to the roof just implicates me when I would have no reason to. I also wouldn't need to stab him more than once with the needle, if I did decide to drug him just for the hell of it.

Honestly, the murder looks like a giant mess to me.