Some find helpless little shops and attack those.
Yesterday, I was at storage and there was a girl doing production skills ( I could tell by her hands moving in circles and the little light that *poofs*) when another guild person ran up to her and proceeded to kill her, then run off. I was on my cleric so I rezzed her and restored her life. She apparently didn't want to guild war because she immediately logged off. However, the person that killed her came back to storage looking for her again.
I guess some guilds like to attack easy targets because it somehow makes them feel real big and bad to attack people that are afk or in the middle of production.
I know this wasn't the answer that you were looking for - but apparently it is an effective way to attack and kill someone during a guild war.