[Not long after Billy arrives, Jason comes back. The boy is only a few inches taller than Tim and judging by his suit, is certainly not the same Robin Billy knows.

He tenses up upon seeing Billy and mentally kicks himself for letting Tim be himself. He knew it was a risk but he had no idea if taking Tim with him while he investigated a shady hotel room would be much better]

Who are you?

[Him and Tim not knowing how they wound up in Central City and needing a way to get back is already serious enough. He's not about to let Tim get snatched away again]