I know I couldn't survive that. Could you? But all of that were fake, so nothing to worry about, right? Even if he fells off the island, everything will be still okay! Or maybe not.
But anyways, how did Laguna know that it takes love, friendship and courage to return safely during the time decompression? Did the doctor tell him? Or was Laguna the victim of a previous time compression (or decompression) so he knew how to survive? Thinking of Raine and stuff.
It's amazing how thoughts of friends and love can bend gigantic space and teleport to somewhere real from your mind in the brink of an eye!