So, did I miss something. What is with the "infected" helmet? I don't recall seeing anything in the movie.
There's a good chance it may have been in a scene that was cut from the final edit of the film... maybe it will be in the extended version or deleted scenes... I doubt HT would make something like that randomly without given a design for it by marvel. We were never given a reason as to why Tony decided to stop using 43 and go to 45. I have a feeling that may have originally been the intended reason.