Watson, when the gaslamps flicker out, do not run blindly. Stand still and let your eyes adjust.
Watson, when the hound is unleashed, slip into the fog. Pride is a poor shield against a bullet.
A wounded horse can still pull the carriage, Watson. Apply the tourniquet and move swiftly before nightfall.
We have found the mastermind, Watson. Strike decisively, but do not expect London to reform overnight.
Watson, we have penetrated the very heart of the conspiracy. Pack your bags; our presence here is compromised.
Watson, play the fool. When surrounded by wolves, a display of cleverness is merely an invitation to dinner.
The fog is lifting, Watson. The villain's own hubris has delivered him into our hands at last.