You tread through your complex, sneakily, which is a very hard feat for you to pull off on a regular day. Luckily, you have devised a most simple — yet impeccably calculated — measure to avoid any more immediate questionings: THE CLOSED OFF BACK ALLEY DOOR!
Of course, as this is a historical moment that hinges on your daring intervention, a slightly out-of-character course of action is warranted; all just a part of this rigorous exam.
Soon, you'll be making enough noise that everyone on the Mass will start to believe they have surround sound ear enhancers.