Really? I think you should not drive if you can't see a human-sized object in broad daylight.

In reply to this comment by aimpoint:
All those cars in the beginning overpassed the biker.

One second the bus is in the right lane, the next its on the left. How quickly did that bus change lanes?

I would imagine the kid tried to pass the bus as he passed the car but didn't see the biker compared to the much larger profile (and shadow) of the bus.

I don't think he should have ran, but at the same time I don't think he even saw him.