you can clearly hear noises of stoping records and play, in a room, you don't hear any usual noise of strets in open air. there was no prayer calling at the moment of the dance. it is part of the joke as if suddenly the music came from somewhere cutting the prayer.
WHO: Polio back in Europe for first time since 2010 (Reuters)
from the article: IDF soldiers face penalty after uploading Hebron dance video to YouTube