Quickly they climbed the river banks just before a wall of water descended where they had been in that old dry river bed.
(a wall of water; descended; where they had been in that old dry river bed) Context(a wall of water descended,List([49, 74))):(they; had been; in that old dry river bed)
a wall of water descended,List([49, 74))
a wall of water they
descended had been
where they had been in that old dry river bed
in that old dry river bed