In the mist of thinking both his wife and unborn child were dead Gabriel ascended to the legendary Rukaisho Super slayer nine tail fox and single handedly struck fear in all of hell and death to most that got in his path or line of sight.

With all demon soldiers high ranking officers an generals alike dead before the demon king Dokuro
It didn’t take a scholar to see he was Horrified at the sight of Gabriel’s full potential

For a little context the environment of hell is so toxic to mortals even if you were able to use the abilities of light energy like the slayers you wouldn’t be able to access this transformation in hell you’ll be overwhelmed with the sense of exhaustion in minutes.

So as the chosen one it became very clear that he could never be put in a box with the rest of us and that it was also very clear that if The Demon king did not lie and say that he had the power to bring back his wife and child he would’ve certainly died there.