Interesting. Think I remember seeing her try to gain steam on Twitter but forgot about it. Two takeaways: 1, I never heard real rumblings about the incident, which bodes well. 2, very hard to argue that's an actor's fault, and there's nothing inherent to chainsaws (versus another scare zone performer) that would trigger the incident.
Actors can be fired for misconduct regardless of the union, make no mistake.