They began to sweep the valley like game beaters while those on the side made sure their prey did not escape that way.

The prey continues to struggle while it is being transported and may escape.

That way she can be sure her prey is not escaping.

If so, D'kar could be killed and his prey would escape.

They were a well-meaning but overwhelming family, and it was with difficulty that their prey escaped.

From the signs, though, I rather think that his prey escaped him.

He was many times very close to success but his prey always escaped him.

There was no chance for them to form a new ring before their prey escaped.

Their prey cannot escape detection by remaining still, however.

To help provide the illusion that the prey might escape.