The young girl is airborne as she falls into the lake.
A girl has tripped and fallen into a pile of raked leaves.
A particular girl was airborne as falls while the other has tripped and fallen and both cannot happen the same time.
The girl cannot be in a pile of leaves and in a lake at the same time.
The girl cannot be airborne if she has tripped and fallen. A lake and a pile of leaves are not the same thing.