Non veni pacem mittere, sed gladium.
The intensity of cloud bursts is bound to do this sort of thing. Vigilance is the only thing that will protect you.
The driver seemed calm, cool and collected. Good job.
And he wisely turned around, rather (than like so many other idiots) kept trying to go forward and getting trapped.
And now I am having a flashback to the 1950s horror films I watched growing up. Good work and good sense on the driver's part.