As you go further and further, opening doors and going to the next room, your at room A-15, labeled above the door you were about to open it, as you open it. You heard like a very LOUD distorted bass drum sound followed by likely electric and scratching noises as its ambience, gradually becoming soft to loud. You saw an yellow entity, it was heading towards an grey locker to check and see if anyone is there. And there's one moment, where this 'A-15' entity noticed you.

"Mmm..?"