People get arrested all the time for planning to commit crimes, even before they actually carry them out. I'm not sure why the fire alarm part is suddenly relevant here. Someone argued that because he had a legal right or what they though to be a legal right to be in a building meant that he can't be charged with disrupting proceedings because he didn't enter the building illegally. I was saying, no that isn't correct... that if he went there with a specific intent it is likely he didn't have a legal right to be there.