And they knew then where the blood had come from.

But he did not know where the blood came from.

He couldn't figure out where the blood had come from.

There was blood coming from the back of her head.

But even then, I had no idea where the blood came from or what it was for.

At night, blood came out of his eyes, and very soon he died.

There was a lot of blood coming from his mouth.

There was no blood coming out of his mouth or anything.

If the blood comes from one of us, I know it'll work.

She tried to speak, but blood came from her mouth.