The easyJet aircraft involved in this would have played an automatic PA when the masks deployed, but if the passengers were screaming they probably didn't hear it, or just didn't pay attention to it.
And don't you just love the way the person in this picture travelling with the child took a photo. Personally I would have been more concerned about making sure my family were ok, taking a photo (to sell on to the media) would have been the last thing on my mind.
