It took a moment for Arthur to figure out the message, but once he did, he nodded. "I can help, sure," he said softly. Just because she couldn't talk didn't mean she couldn't hear. "Are you deaf?" He figured he might as well ask, because if she couldn't hear either that would make communication all the more interesting.
Bells. He'd heard the bells. She must be a fairy from the Enchanted Forest. Or she would be, probably, if he bought into the whole thing. Since it was a dream, anything was possible.