Why THIS is the key scene to Ken Loach's Kes

An analysis of the key scene in Kes, exploring the themes and main character of Ken Loach's social-realist masterpiece from 1969. Should be helpful to new writers looking to understand the power of subtext.
In essence, the subtext in one key scene seems to establish a parallel between its protagonist, Billy Casper, and the bird he's training, Kes.
WARNING: SPOILERS.
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