Just seems dumb not to watch the road.
I think the idea of Mansfield bars is that the front head lights and radiator take the brunt of the hit and you are decelerating from that hit. Not using the windscreen as the point of impact and then the deceleration. From old TV safety vids that have done the rounds the bars take the hit and crumble underneath just as much as the cars crumple zones, but they stop you cutting the top of a car off.
74 mph impact probably would have killed him regardless. internal injuries and even the Mansfield is gonna struggle to crumple before the windscreen hit.
Should just keep your eye on the road.