The fearlings immediately descended, not on the adults who could see them, but on the kids. Their appearance wasn't enough to make them monstrous in Jim's eyes, but that action was.

"Oh, they'll leave all right!"

Before Raph could object, Jim had dropped the surfer and kicked it into gear, trusting on the strength of the rockets thrusters to break Raph's grip on his arm as he zoomed at the black shreds of nightmare.