Walk around while Class C in motion?

It's been over 20 years since I owned a motorhome, and I admit I personally never had any issues with folks moving around. I do have an acquaintance who's wife ended up in the emergency room after he launched her off the toilet seat when he had to perform and emergency stop because of a driver who drifted off the road, over corrected and crossed in front of him. He barely clipped the oncoming car and did little damage to the RV. The wife however broke her nose, had her dignity somewhat wounded, and still blames him to this day for telling her to just use the toilet while they were driving rather than pulling over. Personally while it isn't an option with my current setup, I'm thinking I would learn from the experiences of others and not chance the added risk of injury.