How can fennec foxes eat scorpions?
Very carefully.  First remove the stinger, the rest is relatively easy.  In your video, you see the fox quickly bite at the stinger, then back off.  Over and over until the scorpion's abdomen was loose as a rag, unable to launch the stinger at 3:08 minutes.  3:32 - you can see the stinger is almost off.  3:40 - stinger gone, she can now eat it more calmly.