Board Thread:Anime/Game Discussion/@comment-30778594-20180407013411

If you stop at the 10-12 second mark of part 2 opening, you can see hermit purple whilst joseph is split in three

This was also confirmed by Araki in his interview :

"Hamon is life energy that travels through the entire body through a special breathing method. Therefore, a concrete visualization of it would be some sort of wire wrapped around the entire body, like a vine. If Jotaro's group time traveled to the world of Part 2, they would probably be able to see "Hermit Purple" wrapped around Joseph just like in Part 3."

-Araki Hirohiko 