"Odd. It's not yours, definitely not Isaac's handwriting...who could have left this? Why tell me to leave it alone?" She asked, mostly to herself. She sighed softly before looking at him. "I'm sorry, I shouldn't be asking you things when you don't have a way to respond." She said before getting an idea. 

"Do you know sign language? If not, I know a little I can teach you. I can even give you the book I own so you can practice." She offered. If he agreed, at least he'd be able to speak and express himself better than just emotions.