Transformation potions are special. They require government authorization and specialist supervision. Only medical mages can issue prescriptions for them. And licensed potion pharmacists are the only ones who can formulate them. I presume you already know all this, of course. Those who take them undergo major physiological changes. So treating injuries of such individuals requires more care. It's actually illegal to practice medicine on them without a specialist license. Which means that if you got injured here, I would risk running afoul of the law. And that must be avoided at all costs! Hence, I cannot let any injury befall you. It's that simple.
Given how you were acting, I think it was reasonable to assume you were patronizing me. Your absurd adherence to the rules isn't intuitive to most other people.