Without a data HUD in the camera display you can only guess as to speeds. Given that both vehicles are going the same direction the closing rate between the two is still not small. If the cruiser is going the speed limit the bike is well under.
If the bike is going the speed limit the cruiser is busting the legal limit though. There's nothing good about any of it. The riders are still fortunate they went over the car and dissipated a lot of energy there and rolling rather than getting caught with the bike in front of the cruiser.
If the closing rate had been very slight that might not have happened. Just a nudge then down everything they all would have gone. Getting kicked up the higher speed might have saved their lives.
What's your guess? Officer texting or dozed off? I'd vote for texting.