I was riding along yesterday in zone 2 with a nice tailwind at about 20 mph. I look down for a second and saw an extra shadow ! Apparently someone was drafting me and I didn't even know he was back there. I just continued to ride for a bit then slowed a little and he finally pulled out and rode on without saying anything. This particular section of the path is prone to random deer and kamikaze squirrels. Am I wrong for being kinda upset that he didn't announce? I have no idea how long he was back there before I noticed him and had he let me know I would have had no problem pulling him along. What would you have done ?