Although he had previously killed an Extraordinary Centaur, despite both being Extraordinary Demons, an Extraordinary Centaur and one of the Four Great Generals were clearly not enemies on the same level.
He knew very well that Gauss's advantage lay in short bursts of power. It was exactly through that wave of Spells exceeding the limits of his own strength that he had blasted the Extraordinary Centaur to death. However, the combat endurance of each of the Four Great Generals was terrifyingly strong. Conventional attack methods would find it hard to kill them in a short time. After all, there was no precedent for how Gauss would perform in a prolonged battle of this intensity.
But looking at it now, Gauss was undoubtedly performing exceptionally well.
