Every once in a while, and it is rare enough that Mycroft can immediately list every incident, and it would be a good test for any doctor, should they need to test him for a head injury, when Sherlock genuinely surprises him.

The expression of concern is now added to the list.

"I will be fine." He does not add how he will personally call Jessica's family to offer condolences, once it is determined how the official story of Jessica's death will be told.