"I know I have to train up, but I don't know how Arrow moves so fast. I'm not exactly a ninja. Just yet." Hartley grinned and stole a fry, then raised his eyebrows as he looked at Cisco. "Although I have discovered that I can do this."

That said he hummed until he found the right tune and he watched Cisco, knowing that even though he'd know he was here, he should suddenly not be able to detect him. It was a pretty neat trick, as far as potential ninjahood was concerned.