He's One Of Us!

"Hmm, okay," The Principal nodded. 

He still hasn't been able to get the actual strength of the corpses since they haven't made any moves yet. 

"Stay here, I'll try to see the extent of their strength. If you see things get difficult for me, run," The Principal said before going forward. 

The others understood what he meant, so they didn't try to follow him, rather, they even took a few steps back. 

Lightning could be seen moving across the Principal's body, with a flash, he suddenly disappeared, appearing in the middle of the corpses. 

The moment he appeared, he attacked, sending out a powerful bolt of lightning that went in all directions. 

The impact of the attack forced the corpses back, but three of them only retreated five steps back before keeping their balance once again.