"Curtis, you're...terrific." Line of the episode? I'd say so, both because it was incredibly cheesy, and a ridiculously on-the-nose reference to Holt's comic book alter-ego, Mr Terrific. With the fact he's got the name, and has started developing his T-Spheres, it's surely only a matter of time before the transformation takes place, and this reference really pushes that, suggesting that it should be coming soon. Curtis is already a really fun part of the show, but he's mostly on the edges of it, dealing only with Felicity. Making him Mr Terrific would be a way to bring him into the main fold, and based on his appearances this year, that should be a good thing. Curtis' other notable contribution to this episode was developing the technology that should allow Felicity to walk again. It's hardly a surprise that they're finding a way of making this happen, though as always with Arrow, there's the potential for a slight curveball if it doesn't actually work, or at least setup for it failing at a crucial moment somewhere in the future.