That steam pipe is very close to the grate. There are people claiming a shooter fired from the steam pipe area and then escaped by going down that grate/underground pipe. I don't believe that scenario, but claiming alleged smoke was steam only fuels this theory. I have never heard or read about steam actually leaking from that pipe. I understand they were in the process of moving that pipe, but claiming steam was leaking from it sounds as desperate as a possible shooter escaping via that grate. The Wiegman Film still frame to me, shows something high and close to the Triple Underpass. I think the, "tree leaves turning color", explanation does make sense. This does not address Holland's story, but it does put the steam pipe stuff to bed.
