Following a chase around London with Sherlock , in which he forgets his cane at a restaurant , John 's limp disappears .
Mycroft observes that in a stressful situation John has no sign of a hand tremor .
Following a chase around London with Sherlock , in which he forgets his cane at a restaurant , John 's limp disappears , and Mycroft observes that in a stressful situation John has no sign of a hand tremor .