Holmes had an accident?
Didn't he go to see Mr. Butler?
Could it be that Mr. Butler, having discovered that the underground laboratory was attacked, became furiously embarrassed and took his anger out on Holmes?
"Kitty monitoring the Westminster district of London reports that Holmes was attacked by a monster that emerged from the water while he was passing London Bridge, preparing to cross the Thames River to return,"
Fat Orange said, "Holmes's carriage was swallowed by the monster, and now that creature is heading towards St. Paul's Cathedral."
"The monster... is it the leader of a supernatural being's clan?"
"It should be, judging by Kitty's description, which resembles the legendary water beast."