While the main character is at the park with the boy & Spot, a couple women start yelling that a thief is stealing their purse. They are seen & heard quite clearly yelling "Help! Help! Stop him, he's taking my purse" or something along those lines. When Spot retrieves the purse & returns it to the women it turns out they are both deaf & mute, able to communicate only in sign language, thus leading to a (supposedly) humorous misunderstanding with the main character. If they can't talk, how were they able to yell about the robbery?