Claire realizes she can climb inside Shuichi to control him. This "fusion" allows them to share senses and emotions, combining Shuichi's raw strength with Claire's ruthless tactical mind.
In episode 2 of the Gleipnir dub, titled the story shifts from the mystery of Shuichi’s transformation to the brutal reality of the world he and Claire have entered. Plot Summary & Key Events Gleipnir (Dub) Episode 2
Shuichi and Claire are attacked by Hikawa, a "Gatherer" who gained super-speed from a golden coin to win at track but became a monster in the process. Claire realizes she can climb inside Shuichi to control him
During the battle, Claire takes complete control and brutally kills Hikawa. This establishes Claire’s sociopathic tendencies and Shuichi’s trauma over his loss of agency. Plot Summary & Key Events Shuichi and Claire
As the mysterious attacker closes in, Clair discovers something about Shuichi's costume form... And that changes everything. Crunchyroll