Blas Falconer reads "Fatherland"

The transcript describes a poem titled 'Fatherland', which was initially called 'Dear America'. The poem narrates a scene at a park where a father and son observe a boy enjoying a slide. The father then notices a man with a swastika tattoo, evoking a sense of tension and reflection on perceptions of goodness and danger.

How did the narrator's son react to the situation at the park?

What does the phrase 'the foot or two between us, perilous, uncrossable' suggest about the narrator's feelings?