Rein still did not understand what made her so powerful. Sure her raw strength was on par with his own, at least without any Springs, but he hadn't seen what her system could do in a fight yet. Throwing caution to the wind, Rein activated his Spring, having taken Roki's Inverted Spring before beginning the battle. This meant that he could instantly teleport to anybody looking at him.
He appeared before Charla as she was cycling through souls and sliced his swords cleanly through her neck, making a head fly off her shoulders. However, Rein didn't let his guard down. He defended himself with his blades as he sensed a powerful force dangerously accelerating at him.
It impacted against his black steel swords, launching him downwards into the water they stood on, creating a wave of salty liquid that splashed up into the clear blue sky, shimmering under the sunlight.