Thanks for taking the time to read and review. I understand your point about the prologue to some extent. It's there partly because of comments I got on this site from people who found my jumping straight into the action too confusing. Overall, I suspect it's going to stay for readers on this site, though it may go later.
I'd have to be honest and say that it's frustrating to be told there are grammar errors and then not be told what they are. I'm aware that some of my characters are not grammatically 'correct'. I wrote them like that because that's the way people actually speak where they come from.
Are you referring to grammatical errors of theirs or of mine, though?
That aside, I'd like to thank you again for taking the time and trouble.