Earlier quoted context omitted.
Lack of easy transportation can quickly turn a merely inconvenient or uncomfortable situation into an extremely dangerous one. Break a leg in front of the hospital? Super minor. Break a leg 40 miles from the nearest road? Extremely serious. Mud, especially with huge numbers of people, has a way of turning the former situation into the latter situation rather quickly. Also who’s being breathless? The article didn’t me…
Breaking a leg isn't serious if medical transportation is available, and it sounds like it is.
No one is asking to fly in the military here or something. People are observing: “oh, that seems like a risky situation that could go very south very quickly.”