I wasn't there but chiming in since I did read a lady say in a facebook group (which one I don't remember) she was swept because she made it into that little rectangle area on the map, but right behind her they rerouted everyone to cut that rectangle off. She said it was 1/2 mile about cutoff.
Okay found the comments both from the same person in rundisneyrun group -
".but not too long before I was swept, somewhere between miles 7 and 8, they rerouted what looked like a couple hundred people who were behind me and had them skip the whole loop, and then about 20-30 of us who were slow but still ahead of them were swept. It was weird, but I am guessing a couple hundred people finished a 12.5ish mile half marathon on Sunday."
" I thought they got pulled to the side to be swept, but they were fed into the race. If you look at the map, there is a small loop between miles 7 and 8 on the corner of Harbor and Boardway. I was one of the last two people who went through, and everyone behind me was rerouted down Harbor, and we went around the loop and were swept right after the medical tent.
"