Why Anakin Couldn’t Force Pull Obi-Wan Into the Lava on Mustafar

In today’s video I want to go over a question I saw in the comments regarding what if anakin pulled obi-wan into the lava on Mustafar in Star Wars Revenge of the Sith? What would have happened if he did this? Before we get to the fan-fiction of it, I think it’d be good to explain just why he couldn’t do this first.