I'm surprised the vehicle didn't detect an object moving into its field of view. What are the expectations from the driver under the terms of Arizona's self-dr

I'm surprised the vehicle didn't detect an object moving into its field of view. What are the expectations from the driver under the terms of Arizona's self-driving car laws? Are they expected to remain engaged as a driver, or are they permitted to allow the car to perform all of the driving? It's impossible to say whether an attentive drive would have changed the outcome of this scenario -- largely because a highly compressed video doesn't really convey what the driver actually was capable of seeing, but it's very clear from the video that the driver was more focused on a phone (or some other device) and was not an active participant in driving the vehicle.