[He takes Sherlock's word for it. Since John hasn't seen the transformation for himself he can only imagine it based off what little information he has. None of it good. Considering their circumstances at the time all John had been able to do was offer advice to get the patient into the cold water to decrease his body temperature.]

I'll schedule something in the near future. [After the memory sharing situation has passed. Neither of them want any other Foreigners or even natives to know why John's getting tests done.] Yeah, he's kind of an idiot when it comes to his own safety. Not wanting others involved in the situation. I tried talking to him once, not exactly sure if I actually got through to him even after we'd known each other for months.

[So he doesn't know if he could do it now after only a month of knowing each other.]