I don't know how you can speculate on the failure mode of the VS with any credibility. The way it would fail in the circumstances described would depend on a number of factors that we are simply not privy to.
e.g
Failure mode/structural configuration of the surface to which it is mounted.
Centre of gravity (typically quite near the root in fact).
Any air loads on it.
Configuration/relative strength of the mountings.
Relative angle to impact acceleration.
etc
etc
Pure speculation