This happens in PvP, on the condition of when the base is took over by Rag, and if Rag got damaged, the base would take exactly the same amount of damage that Rag took. ( eg. deep breath will damage both rag and the base at the same time.)
So what was the purpose of this hero? It is supposed to be a shield of a tower right? Now I spend 5 gold to play a 0 damage absorbing shield plus useless base against ranged attackers. I feel like I am a joke. But the shame is not on me.