The phrase "the situation demands" is correct and usable in written English. You can use it when talking about something that must be done in order to achieve a desired result. For example: "The situation demands that we take action now."
The situation demands it".
"But sometimes the situation demands it".
Sometimes, the situation demands quite a bit more.
The urgency of the situation demands an immediate response.
Cole, though, believes the situation demands doing anything and everything to get maximum points.
Pakistan's interests differ from those of the United States, and the situation demands flexibility.
She can always control her shudders when the situation demands it.
But beyond this any language can be as precise as the situation demands in kin designation.
I guess he's paid to be wildly optimistic if the situation demands it.
Stretch beyond those you're most comfortable in, depending on what the situation demands.
Whatever he is, he doesn't hesitate to shoot to kill when the situation demands.
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Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia