When Arashi sees the giant fireballs descending onto him, he uses his jetpack to fly to the ground. When he is on the ground, he flows earth chakra throughout his entire body, allowing him to merge with the ground. Arashi hides underground to protect himself from the fireballs. The fireballs crash into the ground, leaving Arashi unharmed. Arashi emerges from the ground.
That was close...
Then Arashi notices that it was raining. He didn't pay much attention to it because he thought it could be a distraction.
Arashi uses his Doton chakra to create some earth in his mouth. Then he uses shape transformation to turn it into a sticky glob of mud. After doing this, Arashi spits it out of his mouth, into Geeel's face. When Gajeel's face is covered in the thick, sticky mud, Arashi uses lightning chakra to create a ball of electricity, then hurls it at Gajeel.