We are shown Saoichiki and Subaru learning this worlds language.
"Ok I will train you two to grow stronger and so Saoichiki can herness that power he used in your last battle."
Says Clastro.
As Clastro says this, four Catanians drop from the sky and without warning begin to attack Subaru and Saoichiki.
As Saoichiki fends off the two Catanians, Subaru is shown being thrown around by them. Saoichiki in a state of panic fends both of his adversary off and rushes to save Subaru, but now it's four on two or technically four on one. Saoichiki is swiftly overwhelmed and Saoichiki is blown away into a cliff side.
Subaru seeing this starts to cry and shout and in mere seconds his eyes turn an obsidian black with crimson red ring around his pupil as black and red lightning surrounds him, crackling as it hits the ground beneath him.
In a blinding never before seen rage Subaru was like a completely different person. As he bared his fangs the ground is crushed beneath his overwhelming power.
"What did Daime do to you Subaru?" 
Says Saoichiki as he fades out of conscience.