Sir Xavier

The two youths had their eyes on Grey, but had different feelings, but it was due to one particular reason. They could tell that Grey was around their age, yet for some reason, Grey could stand side by side in the presence of people they see as Seniors. 

Mark wanted the Blue and Black Protectors to kill Grey, and he knew that given the duo's usual personality, they would've done this already. But for some reason, the duo were actually hesitating. This meant only one thing, Grey was stronger than they were. If Grey was stronger than the duo, that meant he was a Sovereign, and not a weak one at that. Seeing someone their age have strengths they were still dreaming to acquire almost shattered them.