Read through your message, I noticed that your friend seems to have disciplinary issue? So I think the warden is being defensive of their school and their own job when you request to bring your friend with you.

Since the warden has said they will accommodate you to the hospital as an alternative already, not sure what's the fuss.

Malaysia I think have a policy, in order to ensure you come here to study and not come here to work via working visa, first year International student will have to stay in campus.

Since you and your friend are the only 2 Tunisian around here, and your friend have disciplinary issue, it's safe to say that Mr Potter is just being careful.