I have some further information about the accident.  The pilot of the RV was from a fly in community in Florida called Spruce Creek.  (My wife and I have a place there)

A "flight" of 4 RVs had just landed and apparently was being closely followed by a Velocity.  One of the RVs had pulled off the runway and was on a taxiway when the Velocity apparently lost control.  The Velocity veered onto the grass on the side of the runway and flipped end over end, hitting the RV which was on the taxiway.  Both pilot and co-pilot in the RV were killed, probably immediately.

The pilot and passenger in the Velocity were badly burned/otherwise injured and I understand one of them has also died.

Tragic accident, not sure what "take home" safety message is - if any.