Looks like Mr. O'Meara thought he had something here but didn't. Oh well
Don't worry Alan, I hadn't forgotten you. On the road at the moment so I post when I can.
Baker pulls up his bike because he thinks there's shots coming from the TSBD building.
He apparently wants to get in the building and go up to the top floor (something Truly psychically detects).
If this is indeed his intention the Darnell clip seems to show Baker 'overshooting' his approach to the front steps.
The reason for this is obvious if you'd actually bothered to focus on Baker in the Darnell clip [maybe you've seen it already but are being 'shy'].

Still not seeing it?
Baker is looking up the Elm Street extension as he runs towards the steps.
He's not looking where he's running.
That's why he overshoots his approach to the steps and that's how we know his attention isn't on the woman who you believe is trying to point out a banner made out of a parachute and two curtain rods saying "Viva Cuba!" and which could be seen from space.
It comes incorporated with a cloaking device because, not only does nobody on the steps see such a thing, it's not picked up in the Towner film!