Just to reinforce the point, here is a a photo of an athletics sprint finish. On the bike, everything of yours is moving the same speed. Sprinting, parts are moving different speeds, and take longer or short times to cross the laser of the finish line camera, causing distortion.
Notice the first two lanes' strides aren't actual snapshots of the whole stride; no one runs like that. Also notice lane 7, whose foot landed on the line, and is thus recorded for several hundredths in a row. Similarly, lane 6, who stepped just before the line, and whose calf is recorded in several snapshots as it is held over the finish line for several hundredths.

Notice the first two lanes' strides aren't actual snapshots of the whole stride; no one runs like that. Also notice lane 7, whose foot landed on the line, and is thus recorded for several hundredths in a row. Similarly, lane 6, who stepped just before the line, and whose calf is recorded in several snapshots as it is held over the finish line for several hundredths.