I disagree, the analysis of footage has been excellent in the second half of the thread.
I would say the footage is incomplete, doesn't give a full picture of the sequence of events from the start of the dispute, and so in my humble opinion analysis of it cannot be considered excellent without the contributors being in possession of the full facts, regardless of their opinion on what appears to have happened. But worse still is some of the speculation still taking place, see a few posts above for an example!!
For what it is worth, and it is worth nothing, from what we see on the video footage the guard appears to have started to try to resolve the matter with the lady's companion seemingly determined to cause conflict. However I, nor anyone else knows what was said at the beginning of the dispute or at any time when footage was not taken or edited out. This is why I refuse to speculate on the circumstances & feel others should not do so too, or the mods temporarily lock the thread until more factual detail is available, or at least until the investigation by GWR is complete.
But that notwithstanding, my point remains. A guard's career is on the line whilst GWR investigate. People involved with this on both sides may have sight of this thread, and regardless of what people think it can potentially effect the result.