From the screenplay for THE WARRIOR, written by Gavin O'Connor and Anthony Tambakis &
Cliff Dorfman:
INT. BOARDWALK HALL ARENA CAGE - SAME
Frank makes eye contact with the jubilant Tess. Indicates she should meet them in the locker room. Meanwhile, people pour into the cage. Frank pushes them aside, keeping them away from Brendan and Tommy, who remain on the ground, exhausted. Tommy to begins to WEEP.
INT. COLT’S PITTSBURGH FIGHT CLUB - SAME
Silence at Colt’s. Everyone spent from what they’ve seen.
ON TV SCREEN: CHAOS IN THE RING. BRENDAN HOLDS TOMMY IN HIS ARMS AND PUSHES AWAY A DOCTOR.
INT. BOARDWALK HALL ARENA CAGE - SAME
Tommy buries his head in Brendan’s chest. A torrent of sobbing gushes from him, years of pain pouring out in heavy bursts. From the crowd, Paddy stares into the cage and watches as Brendan comforts his little brother, then helps him to his feet.
Callen, Sheridan, and J.J. Riley make their way inside for the post-fight interview, cameras trailing behind them. With Frank continuing to run interference, Brendan pushes through the crush of people, arm around Tommy, and exits the cage.
The crowd parts for Tommy and Brendan. Paddy watches them, a tear in his eye. He’s overwhelmed by the sight of his two boys together again.
As the noise from the arena fades, the brothers walk through the wild crowd and continue on through the tunnel, arm in arm...
Based on that and repeated viewings, I believe all that's happening is the ref wants to get Brendan up to declare him the winner, but Frank is telling him to let Brendan have his moment with his brother (Tommy tapped out, so the winner is obvious). There's no scheme to help Tommy escape; it's safe to say he'll be taken into custody shortly, but director Gavin O'Connor wisely chooses to end on a triumphant note of brotherly solidarity rather than the downer of Tommy getting arrested. A great ending to a great movie.