Their staircase scene was so symbolic!
Shiva has always been there to take the fall for her, wrapping her to safety. Whenever it comes to her, he will take the calamity on himself rather than touch her problematically. In saving her today, he again took the fall, and his back must have bumped the hard wall. Raavi has her mattress to cushion her fall always. She might not come to know that he is hurt in the process, but Shiva will always be there.
On the other hand, when Shiva was tripping, just trying to stabilise himself holding Raavi’s hand. I think in future, too, Raavi might not be the cocoon of comfort but like an anchor needed for his sanity and stability.
He will move mountains and take the fall for her, but she will be there to give him what he needs the most: sanity and stability.