The other clue is that it goes well into the unexposed rebate area in the really hot streaks. I am sure that I don't have a camera that selectively leaks light only occasionally into rebate areas of the negative. I really don't know if it technically is 'infectious' development, but there were definitely some weird artifacts on many of the frames on that roll that cannot be explained by execution goofs. Check out the streak on a portion of another frame from the same roll in the technical gallery.