Mary was glad that Anna returned Johnny's smile. As far as she could tell, Anna was as accepting of Johnny as Cas seemed to be. Which made sense, given how close those two seemed to be. She was just glad that there was someone in their party who wasn't questioning whether or not he should be allowed to live. She just... wished that she didn't have to worry about her parents and her sort of brother in that equation.
"Bigger than piranha. You'll see," Mary said.
It wasn't that she was trying to be vague but simply that in this case, she wasn't sure she could truly explain. Seeing was the only way to truly get what those creatures were.
She looked up at Johnny as they walked.
"How are you doing?" she asked softly, still worried about the physical exertion.