Ok I am curious about what you guys think about a situation that came up while I played in someone else's game.
We were adventuring in a home brew world inspired by warhammer fantasy RP's setting. It used a mix of 3.5e and Pathfinder as well as a few other d20 supplements. I was playing Freya (prideful Dwarf fighter/barbarian), my friend was playing Luna (flirty elf ranger(archery style)), munchkin was playing Krell (unscrupulous ratman thief/ninja or assassin build), hound was playing Peter (enigmatic human priest), and mr perfect was GMing.
We had been hired to clear the undead out of an old graveyard by the locals and had been rather successful in removing this stain of evil from the reclaimed cemetery. So successful that a visiting lord from the Empire asked us to be his guests at a dinner in our honor. We were all given noble finery to wear and allowed plenty of time to clean ourselves up for this important and handsome figure. After all the regal ceremony starting the evening... the lord was taking credit publicly for our actions (his money did hire us, so it was sort of accurate). Then we entered the mayors house to begin our private meal and entertainment. The lord was absolutely charming and made passes at both Freya and Luna. Luna went all flirty over him and Freya decided she wasn't going to get brushed aside so easily despite not truly being interested in starting something with a human regardless of how charming he was. Her pride was on the line so she pursued the lord with plenty of dwarven class and even managed to out dance Luna during the ball. Personally I wonder what was really going on and if this was just a distraction for our characters devised by a clever GM so we wouldn't be too interested in all the back room deals Krell and Peter were making. Either way, though I fought a good fight for the lord's attention, Luna won and she went off to be alone with him after the party. That morning the three of us got geared up for our next mission and wondered where Luna was. We left word at the inn we would wait for her at the town gates. Plenty of jokes flew about just what sort of shameless behavior Luna and Lord Charming had been engaged in over the night. When Luna did appear she was enraged and demanded we all head back and assassinate Lord Charming. I tried to calm her down and find out what Lord not-so-Charming-after-all had done but she wouldn't talk about it. She was however adamant that we kill the beast. I balked... I wanted a reason to go killing, Freya was good after all. I needed to know I was doing the right thing. She exploded with anger and attacked me instead. Well after the initial wound she gave me during the totally-surprised-that-a-friend-would-attack-me round the battle quickly turned my way and I accidentally killed her after two critical hits with an axe back to back. Krell and Peter just watched us and Krell called out "cat fight" while Peter laughed. Now we apologized to each other and the game will continue after she makes a new character... probably a snobby elf wizard of some sort if she doesn't change her mind.
But she wasn't just angry in character and while she is putting it all behind her she still won't talk about what happened. The GM is also silent on the matter. And I am wondering who was at fault here? The likely candidate seems to be the GM... BUT her anger was directed at the three of us NOT the GM. The only things I can see that may have upset her were competing with her for whatever subplot story element the not-so-Charming-after-all Lord was building or refusing to just murder someone without knowing why. Was she wrong? It did feel like betrayal when she attacked me. Was I wrong? Was this somehow Krell or Peter's fault secretly and she just attacked me for not seeing it? Did she overhear some of the off color jokes while she was in the secret room playing out this subplot one on one with the GM?
Maybe the internet can shed some new way of looking at this I am not seeing.