this is made up.

It should be soulsand but the souls in it are mad and angry, it is my idea for the future updates of minecraft - when you walk on soulsand you must hold shift or the soulsand will turn like this and will make damage.. It activates some nearby soulsand blocks too. If you like the idea please support by voting! It would mean much to me.. And if you want, post this on the mojang site like an idea but don't take the credit for it :D..

Stay awesome guys!