Sione danced across the field a bit with his big line break from the Kennedy pass. He isn't express pace wise either (not exactly slow though)
Should be no excuse for not backing a player up more in that situation. There was time for support to push up with him
He deadset had to stop in his tracks (Brailey style) after beating half a team and look for a support runner which he eventually did and he offloaded to them but a support player running with him alongside could have gone all the way and scored a try down the Warriors end from that line break.