Seto scoffed as he looks to see the mass attack happen as well as Serena about to touch a gem. "Too late. You should have listened." He watched as the room was consumed with light when the Guardian of the portal was gone. 

Yami watched the events unfold, this past coming back to memory for him. 
He was quite surprised and wondered how he had forgotten such a memory. Seeing it all fade and back in the city with everyone grouped together. Yami looked to everyone and then to Yugi who he took action in catching, kneeling down beside. "Yugi!" He cradled his friend and looked him over. Seeing no injury on him, he side and figured the battle he went through took a toll. Especially since he defended Kaiba and took the damage. "Rest now Yugi." He whispers, then looking for Serena and seeing her close to the portal. 

Seto looks around, especially seeing if the guy was still there and his bone dragon.