I remember there's a word that means people/animal fixing their attention on something. It could be used to describe wolves or otherwise circling around preys. Does anyone know what that word might be?
Hard to know exactly what you're looking for ... so I'll focus on predators circling prey.
How about stalk?
stalk: to pursue or approach prey, quarry, etc., stealthily
The ravenous gray wolves stalked the young injured doe.