Paranormal/Ghost 100 year old courthouse

Graveyard shift patrol. I had locked every door on this floor at an old courthouse in Denver. From the second floor, I can see a woman through the second floor, courtyard window. The building had been cleared and not a single person was inside besides myself. I head up to the third and hear what sounds like footsteps ahead of me along with a young sounding voice...I turn the camera on embarrassed because I done believe in ghosts but this is what I saw....