Nathan would likely be the last person one should ask about readable levels of affection and deceptive bones when they concerned Angela Petrelli, but this epidemic of silence made asking such questions, let alone answering them, all but impossible because Nathan would have snapped his writing instrument in two trying to explain with pictures. Silence reigned, but it didn't mean he wasn't keeping a watchful eye on her, which let him catch her interest in the drawing.
Wriggling out of Angela's lap before Nathan could act, Monty went to fetch the picture from Nathan and hand it to his grandmother, expression clearly expectant. Simon dove for one of the action figures and one of the sign language books, ready to assist if Angela too didn't seem to understand their idea.