Not asking to see the recordings of "her friends" who were already outside feels like a mistake. Just let the guard know that you work for a person of interest and that it would be a great help to check for reacuring faces. I'm not security by anny means, but this feels like threat asessment 101.
"maybe i imagined it" GIRL IF THEY LOOKED FOR THE SOUND TOO THEN THEY DIDNT IMAGINE IT also now im worried its that one strum talk person cant remember her name but considering the stuff about cyborg blowing up thats probably by her im fearful