Sorry, I've only just seen this. Your breakdown doesn't reflect what happened here. You would be correct if all B had said was "Support X". What we saw above w

Sorry, I've only just seen this. Your breakdown doesn't reflect what happened here. You would be correct if all B had said was "Support X". What we saw above was: A: Claim X B: Support X, I've observed Y. C: Support Y too, please. In this particular case, Y was arguably the inverse of X but it was nevertheless described as having been observed many times, but without any sources.