When Trowa loses his memory , Catherine happens upon him wandering the streets .
When Trowa loses his memory , Catherine convinces him that she really is his older sister , trying to shelter him from the war ( and his fellow Gundam pilots ) .
When Trowa loses his memory , Catherine happens upon him wandering the streets , and convinces him that she really is his older sister , trying to shelter him from the war ( and his fellow Gundam pilots ) .