Ticket to Ride

Lucy's Stand, Ticket to Ride, protects her from pretty much anything bad if she hits her attacked with her tear knives. So I can't help but wonder if she would have lived if she had hit Tooru. We're fairly confident that Wonder of U caused her lung disease, so would she have survived? Or does the Saint's Corpse have limits?

Valentine said that he got Love Train with the power of D4C (travel trough dimensions and make them coexist in the same place at the same time) fused with the power of the Saint's Corpse to redirect misfortune. What if the Corpse wasn't helping Valentine, But Johnny instead? How Tusk's misfortune redirection would've work? Using the fingernails or it's wormholes? And how do you think Lucy's stand was going to be? If she used glass skin and glass tears to defend her how would that been offensively? (Sorry my english, I just wanted to know people's ideas on this)