I've been enjoying my playthrough through it, but did you modify the turret weapon range? It seems like they are hitting me from a lot farther away. I can't even get behind the boxes by the fence in Hawthorn.
Sounds like a script didn't trigger. Best bet would be to reload to a save before the speech started. I've had a lot of problems like that with Skyrim and Fallout 4 and that usually fixes it. If you're not able to do so then the quest is likely permanently broken.
I believe there are plenty of resources already posted here in NMA to get you started. I haven't been here long enough to give you exact threads to go off of but most of them are likely in the modding forum. Not to sound like an ass but the search feature would probably help a lot.
"A man does not have himself killed for a half-pence a day or for a petty distinction. You must speak to the bawls in order to electrify him." - Napoleon Bonaparte