There is a parallel between how Rishi died and how Rudra nearly touched death.
When Rishi was dying, he did not know he was dying, he wasn't aware of Maya's darkness, he had the hope of reuniting with his love in his heart. Yesterday, Rudra did not know he would live, he was not only aware of Maya's darkness but he tried to fill light into it with his Beyhadh pyaar, and even after his heartfelt confession he had no hopes of reuniting with Maya.
Rudra would live, we know by the spoilers, it would be interesting to see how that happens. What can save him when drank the poison that accompanied with Maya's darkness.