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He's tired and probably very sore, hungry and grumpy. What might not bother someone otherwise could probably make them incandescent with rage in that state so you may be right vis. being premature but I guess a lot of people will have been thinking about their safety anyway and debating whether it's worth it so maybe this just pushed him over the edge.
FWIW I didn't think that the statement made by the TCR was very clearly worded so might have contributed to annoyance.
Given that the time penalties for using the E81 haven't been announced yet, as far as I'm aware, isn't that a bit premature?