It would be inaccurate to say Ulquiorra had been on tenterhooks while Ienzo negotiated with Vexen and Marluxia, but he had waited outside the door with an eerie stillness, focussing on the flicker and ebb of reiatsu.

He met Zexion's eyes when he opened the door and stepped through, and responded to his statement with nothing more than a nod, a blink, and a murmur of understanding.

Zexion's reiatsu had stayed steady, and Marluxia's had wavered, dipping lower than normal at points, as if he'd been trying to seem less threatening, or keep something concealed. In the end, Ulquiorra had little interest in how exactly they had convinced their target to join of his own free will, simply that they had.