M. Night Shyamalan’s (“The Sixth Sense,” “Signs”) most arcane and criticized work breathes rarified air. Security guard David Dunne (Bruce Willis) is the sole survivor of a Philadelphia train wreck. A cryptic note leads him to Elijah Price (Samuel L. Jackson), who deals in rare comic books. Price suffers from rare disease: the slightest knock and his bones fracture. As the brooding Price and the (apparently) straightforward Dunne get friendly the movie starts shivering. Shymalan juxtaposes fragility against the indestructible as defined by Price’s beloved action heroes. The Willis-Jackson relationship is of rare depth for a major boxoffice project. As for the ending, Shymalan is still Shymalan.