The way I see it, is that there could be 2 outcomes to doing a barrel roll in a Vulcan...
1. You die
2. You don't die
Now if scenario 1 is the outcome, not too much to worry about other than you would be remembered as the guy that destroyed the last good Vulcan.
If you survive, Well however unlikely that is, Whats the worst that could happen. You will be remembered as the guy with the huge cahoonas that barrel rolled the Vulcan and lived to tell the tale. Plus, if they want to be anal about it, they could take your rating away
Either way, I would rather take my chances fighting a Lion in the bush than barrel rolling a Vulcan.