Konoha had dispatched Kakashi and others to search for traces of the monster, and other countries' lords also ordered their respective Great Ninja Village's shadow ninjas to investigate.
This was a mandatory order from the lords. It's one thing for the higher-ups of the ninja villages to verbally rebel, but taking real action was another matter entirely.
They did not wish to defy the lords' wishes during this period, so they could only send a team out to investigate.
The monster had headed to the Land of Red, and other ninja villages' scouts needed to report to the Konoha ninjas stationed at the border of the Land of Red to get clearance before they could enter.
However, Konoha's ninjas did not need to report when entering other countries' territories.
After all, a weak country has no diplomacy.
But no matter how the ninjas from the five great countries investigated, they found no trace of the monster; it was as if it had suddenly vanished from the world.