[Since his suggested treatments are unneeded, Baymax is going to take a few steps backwards and quietly wait. Hiro's condition has been improving and there's not a lot one can do for a cold, it has to run its course.

He's glad to know that it was nothing on his part that caused Hiro to be distressed, that puts him more at ease.

However, his friend's question does bother Baymax, or rather, the answer does. He is designed and programmed to be non-threatening, however, Hiro has expanded his programming, which has caused him to act against his original purpose once.]

The last time he saw me, his heart rate and breathing rapidly increased and his pupils dilated. These are all common signs of fear.

Yes, I believe Callaghan is afraid of me.

[It's something he doesn't like admitting, but the data is there, he can't argue with what his scanners picked up.]