Reel life imitates real life: Martin Scorsese’s ‘The Departed’ is a thrilling tale of subterfuge and spying gone awry, holding viewers in thrall until the last frame. Alec Baldwin, who played a key role in the movie, would know better. The case of the fatal shooting on the sets of his upcoming movie — the Western named ‘Rust’ — has had a similar trajectory. Not long ago, it seemed that the actor was staring at a 5-year prison term, which was then reduced to 18 months. With prosecutors yesterday dismissing the key involuntary manslaughter charge against Baldwin, he can now breathe easy. We would know in the months to come if he’s entirely out of the woods. [COMMENT BY: Rajagopalan Venkataraman, Assistant Editor-Features]