Board Thread:Questions and Answers/@comment-3250527-20140627033401/@comment-6697950-20140627144128

10-30 seconds would be a rather short time, wouldn't it? Especially if Heathcliff still had some time for a few remarks and Kirito had enough time swing a sword in vain for several seconds.

Either way, Akihiko specifically stated:

“Life can't be recovered so easily. Their consciousness will never return. The dead will disappear— this fact remains true in every world. I created this place only because I wanted to talk with you two— one last time.”

If he had created such a place before the battle, it's logical to assume that he also manipulated the brain frying feature. And he definitely did not have time to create it after the battle.

P.S. Kai... did you just rely on the anime for information...?