I worked with the GIF the OP posted. I posted my video in Post #175. Here it is again.
Where is the arm bar? Where's the pin? It's just hand-fighting. Everyone agrees that's fine. Gallup even grabbed a part of Ramsey's jersey early on and the back official let it go. But then Gallup pushes off to get separation. That's where I stop the video to highlight the push and before Ramsey's acting job. Ramsey is leaning in and then Gallup's push straightens him up. It had an effect. The side picture shows an arm extended which people also said didn't happen. It did. Debatable call, I'd agree, but there's enough there to call and Gallup gave them a lane to do so.