Thank you for your input Andy - given your obvious experience with that, I respect that opinion and will take a moment to look inward, but that only addresses half the problem.
I didn't have an accident. I didn't flinch, didn't even take my focus off of the router - just consciously decided to stop. I did safely stop. That doesn't put safety goggles on my wife.
I think there is merit in trying to prevent the scenario: Ex. I remove all metal tools from my bench when I work with a router because if I slip it could create a lethal projectile. Sure, not slipping is a good way to prevent that too.
I can prevent her from opening that door with a lock... I can't guarantee she will put on safety glasses if she opens that door (in fact I know she won't). We're dealing with a hostile witness/employee here... one whom I love and don't want to see get hurt. I also don't want to see myself get hurt and no matter how safe you are - you can't guarantee it won't catch you eventually.