Spoilers are fine here: The assumption is that bug report sections are going to be spoiler central regardless, because they kind of have to be to clearly discuss issues. Appreciate the thought though, and definitely keep to it outside these threads.
So I assume you're talking about the little walkup and talk Mahir does when you get to Entertainment District II? In theory you're supposed to be stopped there yes, and in my testing it didn't seem possible to move. However, when I was first programming GT, I ended up using a fairly hacky solution for this: I have some dialog before he comes up, then trigger him to come up, and on touch the rest of the dialog happens. At various points during this player movement is frozen, but not ALL, so I tried to get around it by having a 1 second wait, which USUALLY was enough to patch over that gap, but it's really inconsistent. Since then, I've discovered the RIGHT way of doing it: just completely and directly disabling player movement, then turning it back on after. I avoided going back and fixing all the old ones, as they seemed to work well enough, but I'll adjust this one since you were able to get past it. Appreciate the report.