I remember seeing on TV predators circling pack of prey animals, trying to identify a weak one.

This reminds me of the story of The Lion and the Gazelle

Every morning in Africa a gazelle wakes up and knows that it will have to outrun the fastest lion or it will be killed.

And, every morning in Africa a lion wakes up and knows that it will have to outrun the slowest gazelle or it will starve to death.

So, in Africa, it doesn't matter if you are the lion or the gazelle. When that sun comes up, you had better be running.