Of course it sucks immensely, but sometimes these sort of things comes down to pure bad luck. What can I say, deers are sneaky fuckers, but the rollcage did it's part as it is still fully intact and neither the driver nor the passanger was hurt.
Up next is basicly to cut the whole thing apart, go through every component and see what can be salvaged for the next build.

Excuse me for the moment, I need to get some rest now, as do we all.