The rule set in place wasn't even about the patient but to protect Number One's secrets. If it was any normal situation he would simply leave and stop the treatment but then all of his efforts would be wasted. He could only hold back his anger until he was done.
The Hunting Guild members were still stunned by Number One's display of power but they quickly got up from the floor and distanced themselves away from him. The whole room was completely destroyed and some of the adjusting walls were still burning so it didn't make a difference even if they left.
'I only managed to stop them from waking you up but I couldn't stop them from breaking in,' Nami informed regretfully but Number One didn't blame her or Luna. There was a clear difference in strength so they couldn't stop them from entering unless they risked their lives.