Rental Magica Plothole in episode one

I don't generally keep up with fansubs, but I do check out a show from time to time. Right now I'm watching ShugoChara and Rental Magica. Both are okay, but there's a huge plothole in the first episode of Rental Magica that really bugs me, since it's so obvious.

While checking out something on a mountain, Honami and the others suddenly put the pieces together for the other case they're investigating (the disappearance of a girl's grandfather).



The thing is, the girl was telling all this to the president while these guys were on the mountain, so how did they know about the landslide? It's never explained.

I have to admit, I was slightly amused by this scene:

Backward march!