This was an accessible story for me. The introductory sentence definitely pointed to skiing as the activity, and the multiple verbs such as pivoted and cocked I think, carried on the idea of action even though the jump was complete. The dialogue that followed was believable as a coach and athlete would talk. The coach appeared to be a man who wastes neither words nor time. Simon appears cocky and a little smug. To me that suggests adolescence or not yet outgrown adolescent attitudes. It may also show skiing as a major part of Simon's life, to the detriment of some social graces.
I may have been influenced by the verb cocked in paragraphs 1 and 3. Was that a deliberate effort to suggest cockiness? I like it.
The coach appears a steady influence against Simon's attitude. The coach knows Simon has real competition and the details about Innsbruck, Greg being pulled early, and the fact that his qualifications are a real reason for concern.Greg's appearance after the jump shows a man comfortable with something. Maybe with his showing, or one-upsmanship over Simon, or perhaps just with living inside his own skin. That relates to the grin in the next sentence.
after seeing Greg's face, Simon is startled by his green skin. Oh, I liked the phrase "verdant cheekbones.' Anyway, Simon is so startled, he asks his coach for verification. Since Simon did not care about the facts the coach was presenting to him one minute earlier, this is a definite shift in attitude. The coach continues to view Greg in terms of ability and performance, while Simon notices the increase in green-toned people around him.
Simon needs to better his results, and resents the ease with which the Greens dominate his sport. Understandable, really, since things he needs to work at, such as maintaining his weight are problems that don't exist for the Greens. Simon's efforts are stretched more, yet the Green, Greg, easily overmatches him with little effort. The coach may be disturbed with his mutter, but stays in character as he continues to focus on results.
Simon's arrogance after the first jump is replaced by frustration. His description of the greens as abominations is strong, but mitigated by chlorophyll being employed as a performance- enhancing drug. Actually, the final sentence makes Simon appear less immature and more legitimately concerned with his chances.
A note: you may want to consider a hyphen in the phrases ever-familiar in paragraph 7 and performance-enhancing in your final sentence. I can't think of anything else. But I really liked this chapter. Keep writing!