But he knows it's not a matter of life and death.

Every step was a matter of life and death now.

The answer could be a matter of life and death!

I believe it's a matter of life or death for him.

Each decision had been a matter of life or death.

It turned out to be no less than a matter of life and death.

Still, this could be a matter of life and death.

For some, it can be a matter of life and death.

This can be a matter of life and death for these people.

I could tell it was a matter of life or death.