traitorous shadow

upon casting, the target's shadow begins hindering the target. at the start of the target's turn, the target moves in a direction of the choice of the caster, as the shadow walks around. as a bonus action, the caster can give the shadow a different order, dance, or run away. after 1 round the target can begin to make a constitution saving throw to end the spell. if the caster maintains concentration on the spell for five rounds or more the caster can end the spell and cause the target to become frightened of its own shadow