Sam gives the warrior association the duty to tell him which part of the danger zone has an increased amount of demonic energy and dark energy.
He would not be able to be present in every battlefield and in every part of the danger zone at once.
He gave the responsibility to the Warrior Association. Fortunately, all of those legendary grade Warriors are also helping the Warrior Association in this situation.
As you know all the legendary grade Warriors have spread around every one of those battlefields.
It would be easy for them to observe the surrounding area and inform the Warrior Association if they found an increased amount of demonic energy and dark energy.
There is still the presence of demonic energy and dark energy in every one of those battlefields due to those puppets and monsters that appeared in the place before the war began.
The good thing is that, despite having the presence of demonic energy, those battlefields did not have the presence of the demon.
