User blog comment:Dominic1743/“The Trap” Discussion/@comment-33424084-20200119014521/@comment-108.36.76.116-20200122100202

Why sand instead of black liquid? They're not on Earth. They are monster souls without bodies. Remember how Dean needed Benny's bones to free Benny on Earth. Maybe in Purgatory what seem to be their bodies is of the same stuff as the rest of Purgatory, like the rocks, dirt, and perhaps even the trees.