By the time the woman opened the door, he had already sat back down on his bed. He didn’t want to look too suspicious to whoever they sent to deal with a former government assassin. He looked up to find… a nurse. A seemingly ordinary nurse.

“Mr. Robertson?” she said, looking a little nervous.

He was the only one in the room; it didn’t take a genius to figure it out.

“I guess you’re my nurse, huh?” he said with an awkward grin. The nurse smiled back, relieved.

Kaku decided he didn’t really need any kind of medical treatment or prison sentence. However, while he was ready and willing to just walk right out of the building, there were some problems with that:

One, if the building had seastone in its walls (or something similarly inconvenient), then breaking them down probably wasn’t a good idea. Simply touching the stuff would drain his strength, which would put him at a disadvantage when whatever security this place had responded.
Two, speaking of – he couldn’t see outside of his room, so for all he knew, there could be an army out there waiting for him. He was good, but if they were armed with the right equipment, numbers, and strategy, fighting his way out would be more trouble than it was worth.
Three, even if he escaped the building, where was he? Was he on an island? How big was it? How could he escape it?

So, annoying as it was, Kaku decided the best course of action was to play along at this little institute until he had more information. Which shouldn’t be too hard. After all, infiltration was in his job description.