Gravis was in a place that he didn't know, but he was pretty sure that he was pretty close to the defensive line. The fire beam had pushed him for a considerable distance, maybe 500 kilometers or something, but such a distance wasn't that far for his speed. Additionally, he felt some distant shockwaves, which proved that the battle was still relatively close to him.
BZZZZ!
Gravis transformed into lightning immediately and charged towards the west. Right now, by killing and eating the crab, Gravis was back in his peak condition, which meant that he could use his Lightning Transformation without any fear of his Realm dropping.
Some seconds passed in which Gravis only traveled to the west.
CRRRRR!
Suddenly, a thick column of earth rose out of the earth and blocked his way. Gravis simply moved around the column and flew further to the west.
CRRR! CRRR! CRRR!