They nervously speculate about his motives and intentions - he may be a nosy cop or a detective:Doc: He""s no salesman, that""s for sure.Those circumstances threatened to wipe out the entire future McFly family.Marty began meddling in the relationships between his teenaged parents-to-be in order to ensure his own existence by having them get together at the Saturday night ""Enchantment Under the Sea"" dance and fall in love.Find some secluded glade where she can pick wild flowers...And there, my faithful huntsman, you will kill her!" Her eyes expand glaringly when she issues the vicious command...You chose right here to become Jason Bourne"), to serve his country and "save American lives." To prove he wasn""t "weak" and to "let go of David Webb," he chose to kill a black-hooded man bound on a chair in a corner.