I have acquired the power of invisibility for small periods of time and use this to great benefit in many facets of my life.
However, the power ebbs and flows and I go through periods where it is relatively ineffective and during those times I occasionally get "noticed" but not often. I guess I use many tricks to try and "blend in" and one of them (used in this case) is to constantly have my camera to my face, pointing in many directions as if undecided or getting a reading or checking out a new camera - then pause at the right moment, frame and shoot. It helps that I use very quiet, mirrorless rangefinders as the moment of exposure goes unheard - I may continue the ruse and get a few more shots before moving on.