There's something in this frame, it's text but I can't read it at all.
A few frames also have letters appear, but again, they're white on a white background.
This might possibly help. It looks like there might be an "d" and a "y" on the right side of the tower. It matches with the font used on the previous messages, and it's not present in either the previous or the next frames, so it's not just a weird detail on the thing.
EDIT: It seems Connel saw the word "Help". That's interesting.