I just finished my latest playthrough on PotD about 2 weeks ago, maybe it's a console glitch as I have never played it on pc but I can say with certainty that it is broken, I tested it several times and each time the results were the same, if shot into a large group it would hit each target several to a dozen times resulting in them chunking in many scenarios, only seemed to work on groups though as when I tried it on single targets it behaved appropriately.