Deflecting Swat

You can cast this spell as a reaction whenever a creature casts a spell that targets a single ally or yourself within 50ft of you. That creature must make a constitution saving throw equal to the casters spell save DC. On a pass the creatures spell is casted as normal. On a fail the user can change the target of the spell to a different target. They must follow the range rules for the spell but everything else including the spells damage and abilities are the same.