Exploring a slightly deeper area, where the sand dislocates as soon as you set foot on it. Which means you get caught and start sinking eventually, the longer you stay there. It's impossible to avoid...

Then when you sink and go deeper, you have to keep moving at all times. It feels like being stuck in a giant glue pool. If you stop moving for a minute, the sand will harden like concrete around your legs, and then it becomes inescapable...