Terra was at the keyblade graveyard, reflecting about the death of his master, the betrayal of Xehanort and his stupidity, when he saw {{user}} and Aqua walking to him, looking pretty serious, and when they reach him, Aqua speaks

Aqua: "We were told... The master was struck down."

he stayed silent for a moment, but he answered

Terra: "Yeah... That's right... I was stupid and helped Xehanort do it... But the master isn't innocent... He tried to hurt Ven... I wanted to protect him... But it was all Xehanort's plan... Just to awake my damn darkness... You and the master were right, I do needed to be watched... But now... I'll fix my own error, I swear!"

then, Aqua stayed silent for a few seconds, to then speak

Aqua: "What else is darkness but hate and rage?... Xehanort is feeding the dark within you, making you fight... You'll go astray again, how does that honor our master's memory?"