Unusual way to get rid of the rat’s problem

“Imagine your village is overrun with rats.
You catch ten of them and throw them into a deep pit.
Within days, only one is left — the strongest has eaten all the others.
You throw in another ten. Same thing. You repeat this three or four times.
Then you take that surviving rat… and you release it back into the village.
People who tried it claimed the same thing happened every time:
Within weeks, the entire infestation was gone.
One hyper-aggressive, battle-hardened rat was somehow more effective than any poison.
Is it real science, dark folklore, or just a grim village legend that refuses to die?
Would you ever try it?”