Turn the sand into blood!

[RoseSpring]

What does this expressiom mean?

This will turn the sand into blood.

[Rover_KE]

What is the context?

[kenkk2]

What does this expression mean?

This will turn the sand into blood.

1,This will make someone become bravery.
2, This is impossible and will never happen.
To help interpreting it more easily, give others the context at least so that its meaning could be guessed. OR that idiom has been translated from your own language and/or your style?
Not a teacher.

[Tdol]

It sounds as if there will be war or serious conflict to me. It's not a standard English idiom as far as I know.