Originally posted on 04/16/2021:
He was getting ready to call 911, but Chris told Tony he needed him to call a cab and get him out of there because he'd fail the drug test which caused Tony to stop mid-dial. Between that and seeing the branch impaling the baby seat, Tony had enough. It was a combination of Christopher being too much of a liability since he kept falling off the wagon and Tony's soft spot for animals/children.