Sherlock Holmes: A Game of Shadows (2011)

Factual error: In the scene straight after the opening credits we are taken to Baker Street where construction work is being done. This work is identified by a sign with a logo as being for the underground line. The logo type face was developed by a Mr. Edward Johnston for London Underground from 1913 but the distinctive typeface used in the film was not in place until 1919. This is obviously long after the 1891 setting of the film.

Sherlock Holmes: Uh, hmm... Right. Where are the wagons?
Madam Simza Heron: The wagon is too slow. Can't you ride?
Dr. John Watson: It's not that he can't ride... How is it you put it, Holmes?
Sherlock Holmes: They're dangerous at both ends and... Crafty in the middle. Why would I want anything with a mind of its own bobbing about between my legs?

Trivia: After being cast in this film as Professor Moriarty, Jared Harris was asked to re-dub Moriarty's dialog from the original film, which was previously provided by an unknown actor. This new version of the audio is often used in television broadcasts of the first film.

Question: Why would Meinhard need to have been shot if the bomb would have taken everyone in the room out? The only reason I can think of is that Moriarty has considered the possibility of Meinhard surviving and has thus ordered Moran to shoot Meinhard to give him no chance of surviving whatsoever. Can anyone kindly confirm this or give a better explanation?