1. A software bug failed to recognize the obstacles, or misclassified them, or it fell below some probability threshold.

2. LIDAR didn’t work at the time, and the car did not shutdown.

3. The victim‘s clothing absorbs the LIDAR‘s wavelength pretty much completely, such that it appeared as a „black hole“ and was ignored by the algorithm since this occurs commonly. Unlikely though since the bike itself would surely have registered?

4. It’s hard to see on the video, but is the car going up a slope? In that case, if the LIDAR didn‘t look up far enough, it could have failed to see the victim for optical reasons.