For a moment, he idly wonders who this man's father could be, but that train of thought is derailed by another part of the sentence. "Bumi's... gone?" He says with a silent gasp. He knew he was far in the future now... but Bumi had seemed timeliness. Aang focuses his attention on the ground, sniffling slightly. "I... I'm sorry to hear that. But... I'm sure you're doing a good job with his legacy."