Broken CVC joint could be hard to see, but the wheels
appear to be in a correct attitude per the collision?
Ernie is right, a violent collision such as this can allow a person to come out of a four point harness, IF you have a crotch strap please use it.
Also if your roll-bar just slides together at the third leg, look at one of the pictures, the roll bar is bent and coming apart....please bolt your down-leg where it joins the Hoop. Amazing how much stronger the entire roll bar is when the Hoop and the down-leg are bolted together. (This may have been bolted and the violent impact(s) sheared the bolt allowing the hoop to bend?)
Complete and total sympathy and prayers for his family. I've had to knock on too many doors in this type of incidence. Please remember these photo's...don't become a CC headline!