"I'm not going to ask how you just spaced out and then suddenly knew that. You a biotic?" he asks, as they continue to hobble together, looking for 'lockers.'

"I mean," he continues, continuing along the verbal path that Aberdeen is already aware of, "you didn't light up or anything. Biotics usually do when their field flares."

But who knows. Maybe she's just a really good guesser who likes math.