Naturally, they have confidence in their experience. You should not forget that even having the same power level experience is an important factor.
The experience can make a huge difference. This is the reason those 2nd year students have full confidence.
A pin drop of silence is created inside the cafeteria. Currently, everybody is waiting for the decision of David and his friends.
Everybody, including all the teachers, wanted to know what their decision would be. Will they accept the challenge, or will they decline?
If they decline the challenge, those 2nd year students would not be able to do anything.
After this, they would be able to challenge them for two times. In those two years, if David and his friends did not accept the challenge, the second-year students couldn't do anything.