There is no return from exile unless transgression is undone.  Any attempt to return to the garden without a blood atonement cheapens the transgression.  It’s like a man who turns from a whore to kiss his wife.   The affront is as vile as the infidelity.  His wife should vomit in his mouth.

A sword then – precisely because swords shed blood.   Any return to paradise, the place where God and man were married, requires blood, because their union had been as real as could be.