Yami flinched a little knowing he was leaving out details. However he knew he was just trying to not have them fret over Serena so they could focus on their own injuries. But when Raph figured it out Yami flinched a little more visibly. Talk about being called out. 

When he asked about the shadows, he sighed and looked to the limo. "It was likely due to The Bane when we were actually able to give him a physical form. I wonder if that was how the shadows came about." He looked to the limo and, wondering how Serena was. 

When the helicopter showed up, the medical team went to each rider ,provided with a stretcher. Accessing their injuries, they even had Raph and Alister lay on their respective stretch due to their own injuries. While that happened Yami looked to them all. "I'm going to check on Serena." So he leaves to the Limo to check on Serena. 

Peeking in, he could see her shaking even more and goes in to sit next to her. He then pulls her to him and holds her. "I'm so sorry." He murmurs into her hair as he rests his head against hers as he closes his eyes. 

When they say their farewells, Seto is one of the first to head to the limo. Joey, and Marik head back too. "I hope Serena will get better soon." Joey says with a saddened look.