He directed a sneer towards the trio of Young Avengers, eyes meeting Billy's, "There is no longer a fight here, boy. Not with you and yours."
Sinister turned his eyes to glare at Rogue, voice cutting, "My priorities have just changed to a more pressing issue."
A tesseract blossomed at the far end of the room and the Scientist pointed toward it as a father might point a naughty child toward a corner for a time out. His eyes remained on Rogue while he moved to the portal to wait for his marauders to go through.
"Oh, and you might want to move faster," he offered to the entirety of the group. "The self-destruct was set to go off in ten minutes. That was about six minutes ago now and the flatline authorities beginning to explore their way this direction can't run nearly as well as you."
Finally he turned his head and smiled pleasantly toward Billy, "Do be sure to tell your mother that Mister Sinister sends his love."