Not to take anything away from Riley, but the guy who sat up was a dumb ass.

Looking at last Fridays ride, the segment from the last stop light to beacon hill: A1: 39:02 42.6 km/h A2: 41:21 40.2 km/h B1: 50:56 32.6 km/h That is a huge gap between the speed of B1 and A2 where another ride could fit in.