OH, and not all groups are intensely focused pacelines... but you still want to call out the hazards and not do things suddenly - and on our rural roads, don't become a huge amoeba of bikes!

But in that line... if somebody drops something - a light breaks off the bike, a water bottle falls -panic braking is almost *certain* to cause a crash, while riding over whatever it is (especially since it might not be in your way) only *might*.