I saw him running and I knew something was amiss.
Mr. Holmes does not run. He does not fear petty street criminals and it is not in his nature to flee. No matter the odds, the number of criminals, or the circumstances, he always pursues justice. My fellow Inspectors will verify this, for it is this desire to see the problem solved and the criminals apprehended that has proved just as useful to Scotland Yard as his formidable powers of deduction.
I indicated to my constables that we should follow him. If he had finally met his match, it was our duty to assist him in any way possible. The man may not be aware of his limits, but that does not mean that he doesn't have them.
And so, we ran after him, hoping that this would not be the time when he would find that out for himself.
In case anyone cares, the Inspector is not meant to be anyone mentioned in the Canon-just a random Yarder. Though if you were thinking of Lestrade or Gregson while reading, that's fine too. :)