Yeah I get it. This is one of those things that's really hard to convincingly describe online because each individual thing is explainable eg I will write a[i] every time and my format-on-save will change it to List.get(a, i) every newline or whatever.

But you were there and I wasn't and if the overall situation seemed suspicious to you that's evidence at least as strong as any specific thing. Intuition can certainly pick up on weird behavior even if it's hard to explain how after the fact.