Conversation so far:
Did Claudius assassinate Caligula?
On 24 January 41, Caligula was assassinated in a broad-based conspiracy involving the Praetorian commander Cassius Chaerea and several senators.
How was Claudius involved in the assassination of Caligula?
There is no evidence that Claudius had a direct hand in the assassination, although it has been argued that he knew about the plot
What happened with Claudius after the murder of Caligula?
In the chaos following the murder, Claudius witnessed the German guard cut down several uninvolved noblemen, including many of his friends.

Question: Did Claudius do anything to stop the German guard?
Self-contained rewrite: Did Claudius do anything to stop the German guard who was cutting down several uninvolved noblemen, including many of his friends?