It's only later, once John has practically tucked him in (he'd leaned close for an instant, and Sherlock had fleetingly thought—but no), that Sherlock manages to fully investigate Moriarty's note. Expensive ink, expensive card-stock, expensive flowers.

Such a pity, that the bastard's words are so cheap.
  -- Harbor

the fuck is this

MEIN FÜHRER! I CAN WALK!