Sherlock Holmes (Robert Downey, Jr.) fends off two ruffians.

According to USA Today:

“It’s a kind of Japanese street fighting,” explains director Guy Ritchie.  “It uses walking sticks, bowler hats, choke holds to put people to sleep – any means possible.”  The form of martial arts was invented in England in the late 1800s and was mentioned by Sir Arthur Conan Doyle (he used the term “baritsu”) in one of his stories.