If you find yourself unable to move or become plastered to the terrain, don't panic! We have a way for you to get out.
In order to do this, please do the following:
1) Press the "Menu/Options" button
2) Press "X/Square" to access the options menu
3) Then select "Emergency Escape"
This will teleport you to the last soul pyre you activated. Keep in mind that once you've done this, you will be unable to use this function for another hour.