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That along with the other bird you heard could have been the issue. If I have a bird coming towards me, especially trotting, he ain't hearing a peep out of me. Even if he stops, but continues on towards me at a slow pace he ain't hearing nothing from me. If he starts to veer of course a tad I may give him some leaf scratching or something subtle. It could be as simple as he should have been able to see the other bird (you) from that point and when he didn't his instincts took over.