Board Thread:Questions and Answers/@comment-68.5.216.252-20151123232331/@comment-35248429-20180731041505

In the light novel when the doors close on Asuna, kirito and klein only have slivers of their HP left. They most certainly died there. Contrary to popular belief, kirito isn't some god of gaming. The SAO survivors are quite powerful, but they're not invincible.

No particulars about either of Kirito's fights with Yuuki are revealed other than he didn't dual wield and that he lost.

Alfheim doesn't have a marriage feature, but if you were married in SAO that joint storage carries over to alfheim. So Kirito and Asuna should still share storage.