I think there is more to it, my guess is that they would be under order not to enter until someone gives them the ok, in this case it would be to make sure that all animals that could injure EMT or fire fighters are properly secured and not rooming around (like the alligators in the living room for example)
In France the safety of paramedics and such is important, on an active shooting scene for example they will have to stand being a perimeter until the scene is clear. They need to stay safe and not become a victim themselves. That does not mean they will all obey that order.