Grey stood on the same spot as the lightning came crashing down. One after another, it didn't stop, it only got stronger. Grey didn't take a step away from the place he stood, he prepared each time a lightning was about to strike and withstood it without any thoughts of backing down.
The lightning got fiercer, but Grey stood in the same spot. With the help of all the defensive abilities he had in store, he withstood all the attacks. Luckily, he has had a few encounters with not just one but two tortoise type Magical Beasts, one of the Beasts known for their impressive defensive capabilities. Those encounters were enough to equip him with what it took to withstand these attacks.
With every attack, he felt like he was poking ever stronger at the veil blocking his path from getting to the Sovereign Plane. He wanted to achieve this, he was desperate to achieve this. There was no way he would give up now that he was so close to achieving this.