Sherlock is upset at not knowing who the mastermind behind the Noahtic and Drebber cases is, and takes his frustration out on John. While returning by train from an investigation, Sherlock has a chance reunion with William.
However, it is impossible to prove
that I did not do something.
.لكن لا يمكن إثبات أنني لم أفعل شيئا ما
Jedoch ist es unmöglich etwas
nachzuweisen, was ich nicht getan habe.
Sin embargo,
es imposible probar que no hice algo.
Cela dit, je ne peux pas
prouver mon innocence.
Entretanto, é impossível
provar que eu não fiz algo.
Однако я не могу вам доказать,
 что не совершал чего-либо.