It's a stupid move, he knows it. But he still wires the bomb, radios the others. She's angry, afraid, tells him she's coming back. Then Ashley is pinned down. Kaidan tells her to save Ash, it's the right thing. He regrets they won't have that time on shore leave together, but he doesn't regret his sacrifice. Only, it's not his. She comes for him. When Saren flees, she hoists him onto her shoulders and into the Normandy. They watch the blast from orbit. Later, he questions her at the meeting and all she can say is, "I couldn't leave you."