This was legitimately what every interaction between Ben and Vader was like in “Obi Wan.” It was so bad, guys…
At one point a thin wall of fire separated Vader from Obi Wan, and he was just like “Ahhhhh, you’ve foiled me again!!”, and then he just went home.
He did get burnt to crisp, so it’s not a stretch if he got a fire phobia now.
At last, we meet again, for the first time, for the last time.
Pocket sand! Sha-SHAAA!
The real reason Obi-wan fled to Tatooine.
It gets in the joints is his armor, and causes it to grind down and he then dehydrates.