Since before he was born, really. Miles has gotten damned good at clinging stubbornly to life.

He obediently holds the string taut for Daryl, more curious than anything else. He's capable of that much, at least, and he's interested in the work. Even if he doesn't quite realized that he's being tested here. "What are you making?" he asks, peering at the contraption. "Some sort of trap?"