I learned something new today.
I needed one more Group Event to finish yesterday's dailies, and was playing my lowbie Thief. I went to Queensdale and into the Troll Cave, where the stone was ready to be triggered.
The "train", according to map chat, had just finished Oak and was on the way to Boar. I didn't have any Waypoints on that half of the map, and didn't feel like waiting the ten minutes for them to finish their stuff so I could be "allowed" to trigger Troll.
So I triggered the Troll, and realized I'm a level 15 thief, all alone, in the troll cave. I ran like the wind out into the cow fields outside the cave, and kept my distance from the troll, thinking he'd tether back into the cave.
Then I discovered, he's scripted to do stuff! He smashed through the wall surrounding the pasture, made havok with the cows, went across the river to harass the NPCs there (one even shouted "TROLL!" and ran off to the settlement to the south). The troll kept killing cows in the field, breaking the walls to the farm to the west (I didn't even know those walls could be broken), and due to several overlapping event chains at the same time (protect the bee hives, defend the farm), suddenly the area was... alive. The troll is SUPPOSED to be triggered by an unsuspecting lowbie, who then either dies or runs off, leaving the Troll a dynamic moving event in the fields.
Eventually a few randoms wandered by, newbies I thought (no star, low level, not being downlevelled, no achievement gear looks), and started attacking the troll. I ran in to help, and a handful of us, no more than five, had a great fight, reviving each other, taking aggro to give the others a change to revive, and so on.
After the fight, someone typed in /say "Oh my god, that was awesome!", and ran off to do the Bandit skillpoint nearby, asking if anyone could help them with it.
The train rocked up, saw the Troll was dead, and started whispering me expletives and raging in map-chat with some serious cursing. Someone must have seen I triggered the troll, and I got a lot of mail and whispers to the effect of "please die <racial/gender slur>", "hope you get cancer", "stop ruining the game you selfish <expletive>", and so on.
And I could not care less, because someone new to the game had a great time, and that matters way more than the train's selfish needs.
I realize it was my own "selfish needs" that made me trigger the Troll "early", if you look at it from the train's perspective. But screw that noise.