Fast & furious! 15-20MPH headwind blowing off Lake Champlain. Almost blew up chasing down a commuter on an older roadbike. He kept sprinting to catch cyclists in front of him, so that made it even harder. I caught him eventually (20+MPH into the headwind!), then we got mixed up in pedestrians and he put some ground between us because I couldn't pass the peds safely at speed. Got through the peds and matched his speed but then backed off about a half mile (and one hill) from work to cool down. He went another way shortly after that.