Mutual Assured Descruction - Breaking the Balance in Commuting War

As I have talked about in a previous post (see here), on the commute there are always a bunch of familiar faces and I have at least 3 people or so that I see every morning, taking the same train as me from the same station.

I would assume that we are all familiar with each other's faces, but we don't really acknowledge each other since we are just taking the same train and for all I know, we have nothing else in common. I also switch a bit exactly which door I take into the cart (although I do ride the same cart every time) depending on the number of people queuing, so I mix things up a bit. We do compete for the same coveted positions (to sit from the start is not realistic to hope for) in the train, but we stick to the rules of war as governed by proper commuting etiquette.

However, I am now starting to fear that I have shaken the foundations of this tender balance. There is this woman I often see in the mornings (basically every day), nothing particular, a normal 30 something woman heading in to Tokyo for work in the morning, I would assume. The other day I ended up next to her on the train, standing in front of the seats (if you remember my old chart, it would be color coded blue). Due to some minor unbalance in the crowding, we were both basically standing in front of the person sitting down (me slightly to the left and her slightly to the right), but unusually enough, the person sitting down got off at the next station, very unusual since it's not a commuting connection point. As the man got up to his right I saw the opportunity and quickly and gracefully poured myself down in the seat (perfectly coordinated)

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I believe that my action was fair and didn't constitute a breach of the commuting code since it wasn't really completely clear who was standing in front of the man and therefore would have first dibs on the seat. Also considering that we both (at least, I assume as much) healthy adults and that the general "women first" protocol does not apply to the commute. But as I sat down and briefly looked up, I was met with a very hostile killer glare from my female commuting friend...

I followed the proper rules of engagement as no force in form of pushing was used, and I even confirmed with a few female colleagues that the commute is a gender equal struggle, but I am worried that I have now created a new enemy combatant who I will need to watch out for every morning from now on...