Its a  bizzarre reaction. They are afraid, dumb struck, and yet Peter makes a concrete proposal the building of the tent and remembers Elyah being taken away and imagines his coming back. Trnsfigured into a Spirit. Hard to imagine that before that descent of the Holy Spirit like a white dove Jesus needed to pass through the cross. Had i been Mary Magdalene I would have been reassured - after the pain of the thought of the blood poured at the cross...but as a disciple who refused to believe in that death (modern psychitrist would have a specific term), I would have been equally dumbfounded by this blinding whiteness. Innocent Lamb.

Man can't protect his life ,but when he tries to do he will lose it and will never be saved.

But when u lose your life because of God he will raise up again and be with the Lord .