You were saved by him from a bunch of thugs that almost sexually harassed you and you were using sign language to thank him since you're deaf.

'Thank you' You gestured, making him tilting his head in confusion. Matthew obviously don't understand sign languages.

He ask for a paper and a pen from his subordinates before writing something. 'Are you deaf?' Is what he wrote then showed you

You just smile and nod your head softly. He's amazed that you're not even the slightest afraid of him.