Sephiroth's concern for Cloud remained just as strong and as present as before when the blonde didn't seem to be getting any better. In fact, whatever was happening to his partner was getting worse with every second passing.

He was so fixated and distracted by the problem, that he failed to sense the threat taking a swipe at his Meister. It was only fortunate that it was a glancing blow with no injury. However, any thought of fixating on that problem disappeared the moment he saw something far too familiar emerging from Cloud's chest.

'...How...?' Sephiroth managed to mutter in stunned awe as he watched the Black Materia, as ghost-like as it was, beginning to hover and spin around as it absorbed the light around it.