The examinees had to be careful and cautious. This delayed them from accumulating performance points as fast as possible.
If it were not possible to gain performance points by eliminating other examinees, everyone would have peace of mind and would be able to hunt beasts without fear.
But this wasn't the case. In this situation, everyone knew that whatever points they were trying to acquire could be taken from them at any time. This increased the overall difficulty of the test and made the average performance of the examinees lower than the first test.
The only solution they could come to was to form an alliance based on oaths using the Ethera tree as the witness. The basic oath was not to attack each other for points.