"People lie. People have things to hide sometimes." Simon took a sip of soup before leaning against the door. He took a deep breath and decided to be the bigger man. "That was my sister. She's got something of a history; until recently, I was the only doctor she'd allow near her. I understand you were trying to help, but...it's not exactly the easiest situation to explain."
If River could grow, Simon supposed he'd have to. Might as well start with a doctor that only made him want to hit something; another doctor wanted to make him do more - death was certainly involved, or more likely a big cage, deep pond...
"So, thank you for trying to help." Even if Simon didn't agree with the method.