IMO, It could have been worse with a retaining wall, The way he propelled nearly at a straight angle into that guardrail it took the shock of the impact, A wall would not & most likely trapped him in the car if it crumpled up or just the shock of a hard solid hit on his body could have done serious damage, not too mention it kicking to the side & slamming the drivers side against the wall, Thats 2 hard impacts, not good. The only negative was it rolling, BUT it landed on grass. Either way its good to know he's OK.