Lena Drapella | IFSCLena Drapella | IFSC Before getting on the wall in the final round of a paraclimbing competition, 17-year-old Raveena Alli, a climber who’s blind, usually has six minutes to preview the top rope route with her caller, Fernando Vásquez. He tells her how it’ll feel — easy, pumpy, familiar, unfamiliar — and how it’ll flow. He talks her...