Without a doubt, the toughest requirement in Gabriel's first class advancement quest was surviving a battle against multiple hero ranks.
And in a way, it could be said that this was what had been holding him back all this while, because hero ranks were not entities you could easily come across down the street.
Hence the reason Gabriel wanted to use this opportunity to finally fulfill his requirement by facing two hero ranks, which would count as battling multiple hero rank enemies.
After he explained this to the others, they understood why he was adamant about his decision and did not push further, even though Sophie was clearly worried about him. She knew he was strong and that he could fight a hero rank, as he had done the same thing during the Inter Guild Display Event.
However, there was a difference between fighting non intelligent enemies like beasts and intelligent beings like humans.
