Is this a bug?

[hollowleviathan]

You're not taking 'the identity of the other guy', you're thinking with multiple bodies with one consciousness. It's been a while so I don't remember it exactly, but I think the final flamethrower is not arbitrary, but mechanically activated if you try to solve the puzzle as though you are only one person.
1st Situation: You push the button that opens the door freeing the second body and activating the second flamethrower, body B dies by the first flamethrower, you are stuck.
2nd Situation: You die by the first flamethrower, which when spent opens the door to the second body, bypassing the button and keeping second flamethrower disabled. Body B reaches the end.