Ok, funny story. I finally got around to re-yeasting each bottle. I used Safale us-05 since its the only yeast I have around. I opened each bottle, poured a few grains in and resealed. Since I'm frugal, I was gonna reuse the caps. The first two sealed up nice, but the third didn't at all. I used new caps on the rest. At the end, I decided I should recap the first two with new caps. The first bottle went fine, but the second was an absolute gusher. This was after maybe ten minutes with the new yeast added. How can it work that fast?