Satan Swallowed Up Himself at Calvary

And Moses made a serpent of brass, and put it on a pole, and it came to pass, that if a serpent had bitten any man, when he beheld the serpent of brass, he lived.  Numbers 21:9.

The fiery serpents were biting and killing God's people so God gave instructions to Moses to put a brass serpent on a pole and any one who looked at it expectantly with faith would be healed of their snake bite.  

This presents the odd circumstance that a serpent on a pole would destroy the power of fiery serpents.  The power of a serpent destroys the power of other serpents.  This is a foreshadowing of the redemptive Withdrawal principal of the cross, that Evil powers self-destructed in aikido-like fashion at the cross.  Col 2:15.  Aikido is where the thrust of the enemy is reversed and used to defeat the enemy.  The recipient of the opponent's thrust generates no thrust of his own.