Depending on how close he was to the intersection, speeding up may not have been a viable option. Speed and cross roads do not make good friends.
That bike can jump from 40 to 100 fast enough to zap around the car and be back in his lane and decelerating inside 3 seconds. Unless he was passing while he was going through the intersection, and it didn’t sound like he was, there’s no reason he couldn’t have done so. I tend to make most of my two-lane passes like that, so I spend as little time as possible in the opposite lane; doing it that way also minimizes the time available to the passee to try to cut me off.