Here are a couple of videos I have taken of the cicada attack.
This first video is a time-lapse of a Brood X cicada molting on a blade of grass. This time-lapse was taken over a period of about 2.5 hours one night. One picture every 15 seconds. Where a cicada walks over the emerging one and where the emerging cicada flips so it is holding onto its shell I have duplicated each photo 4 times to slow it down and make it easier to see what is happening.
This next video isn't a time lapse, it is just a view of about 20 cicada nymphs crawling aimlessly through the grass. I was taking a timelapse of a molting cicada at night so had a couple of lights turned on, it appears the nymphs are attracted to light.