Ah, yes; that would indeed happen. First question would be: Should you be going into that hostile port while escorting that merchant?
If you were that merchant, how much would you appreciate being led into dangerous waters? I don't think I'd like that and might very well take charge and leave on my own.
Realistically, if you've started from Antigua and are heading for Grenada, you're going through those dangerous waters anyway, unless you're planning on a big detour, which as a merchant I would not like at all! So we're likely to pass French territory. Maybe that's why I'm hiring an escort. And if he wants to try to sneak past rather than fight it out with anything French that shows up, that's fine by me - getting through without a fight is
good.
Did he turn nasty ashore? Or did his ship turn hostile upon transferring to 3D sailing mode again?
I think the SetMutineer function that is used does work ashore and triggers a mutiny later, so I could imagine that would happen.
I've no idea what would have happened later. I landed at Oyster Beach, changed to French flag so I could talk to the store, the merchant got upset, and I lost 10 reputation, at which point I reloaded a savegame. That's also when I realised I didn't need to change flag anyway because storekeepers will trade with you regardless of nationality and relations, if you're Hero.
In the 2 times I have had to fight that ship in an escort mission it was not worth it at all.
1. The crew on that ship is way bigger than mine, so boarding was out of the question. Plus it was always upwind so I couldn't get to it anyway.
Whereas this one was a pitiful little thing, a ketch I think, and I was in a brig.
2. It was nearly impossible to sink and one time I ran out of shot and powder and had to just sail away. The 2nd time I also just sailed away and went to port. When I left it was there but got blasted to splinters by the fort.
Sinking it is not my intention! There's no money in that.
Conclusion: I will only do this one time per game just to get a perk.
Same here. There are other ways to meet enemy ships, preferably a group of merchants with light escort or no escort at all. And I usually have somewhere else I need to go, so don't want to have to detour for someone else's benefit. This one just happened to be going in the right general direction, plus I wanted to go to Grenada anyway to get a gun polished up and let Artois Voysey get mugged.