Ariel scream at the empty space, only to find little Pup was coming behind her. He stand there shaken until she pick him up and offer that they both scream together. Just meant as a cute little bonding moment between the two while life is still calm. Pup saw his brother being murdered recently, a brother who often spoke for him. That's bound to make for a quiet and nervous kid.
Pup is too adorable in winter gear... I just want to pat his lil head and give him a cookie, poor lamb. I think Ariel's gonna be a good mother/sister/guardian to him at least. She was the quiet, shy child once too, after all. She's still got bits of that child in her but I think she's genuinely maturing now, especially now that Quain's dead.