Running The Endline ?

[Chess Ref]

I thought I just saw a thread on this but can't find it, so lets do it again.

Team A scores, team B completes throw-in, then coach of B calls Time Out. teams come out of huddle and the official makes a point of letting everybody know that they can run the endline. Since there was no violation/foul this just seems like it has to be a spot throw-in.

Let me have your feedback please. Thanks