I read that Anakin buries his mother after scaring away some Tuskens beating her. On the return trip he sees a Tusken camp. Some Raider kids see and smile and wave. He walks over to them. By the time the mom looks up, her heads gone. That's who we see decapitated in Trailer C. Then he kills the kids, kills some slavers, and frees slaves for his mom, just like he said he would in TPM. Sounds believable.🙂