"Ah, well, I don't have all the context, but..." Avan places a finger on his chin as he glances up and to the side, recalling the memory. "You and Mr. Genesis visited your mother, and after he left, she told you about an experiment performed on the two of you."

He doesn't bother going into detail because, well, obviously Angeal already knows. He doesn't mention that he saw what happened after that because, well, obviously Angeal's already worried enough. Avan knows the knowledge won't be a problem, so there's no reason to concern Angeal with it.

He rubs the back of his head in embarrassment. "I'm sorry if I made a scary face! Not even I can forgive such callous regard for children!"