The trajectory of the plane is obvious enough that it should be able to predict where it will likely be in 30 seconds or a minute. You can't cheat physics, if it is going down in direction of runway, it is landing or at worst will do go-around, so the services should be alterted runway is no-go automatically
It was night time so idk how obvious it would be that a plane is approaching when you're in a firetruck and probably have a million others things going on that all necessitate your attention as well.