NB, Rudra is the most aggressive, destructive, devastating form of Lord Shiva. He is a destroyer of all evil, the establisher of truth, justice and Dharma. He destroys anything that threatens the universe and the goodness in it. He protects, and nurtures. Without him, the cosmic balance would be unbalanced forever. He destroys to protect.
So can there be any doubt what is the role and purpose of our hero Rudra. He is Rudra, not merely in name. That has been established in the first scene itself, when it unravelled as a story of Rudra and Parvati. Rudra , the destroyer of evil and the protector of the faithful and the Good can only be destined to be the protector and saviour of Parvati. But not just that, he is destined to complete her, make her whole, just as she is the Shakti ie the power of healing goodness which calms him, complements him and makes him whole too. Your post is awesome as usual. It is a portend of the bugle that has been blown for the first scene of this show. I must admit that I dont like the tagline of rakt se likhi prem kahani. Prem kahani dil ke rakt se likhi jaaye toh theek hai. Rudra sheds others blood to protect his Parvati, nothing more , nothing less. He will protect, preserve and in the process heal himself too. Worry not!!