Temporal Distortion

A bubble of time wraps itself around the caster and its attacker and places them at the beginning of the attackers Action/Bonus Action/Reaction.  Both the caster and the attacker understand they have traveled back in time. The creature must make a Constitution saving throw on a failed save the temporal distortion causes all the damage that would have been dealt to be redirected to the attacker.  On a passed save the damage is split evenly between the caster and attacker.  The spell slot used to cast this spell is only spent if the caster takes no damage from the attacker for the rest of the current creature's turn.