I actually like you managed to write around the patient’s confusion, and the reaction at the end to his announcement is great. Nicely done.

The line “Staring with malice at him” sounds a little clunky. I would change the syntax to make the sentence flow better with the rest.
I agree with THX , good job making the reader understand the patient’s confusion and general sense of malaise.

I concur Ana, that’s what I get for writing this quick before work. ;) Hopefully the re-write flows better.