Khazid Hassan (left) in action for Men's Health against Scunthorpe Rangers.
Reeve netted twice for Barnetby in a first half which ended 2-2.
Bradley added another in the second half, but they were sunk by a hat-trick from Hagan, with Dalton the other marksman for Brumby.
Second-placed Crosby Colts Reserves closed the gap to just five points with a stunning 5-2 success at home to Jailhouse.
It was a good response to their midweek defeat in the final of the Nursing Cup against College Wanderers.
But they twice had to come from behind before locking the door on Jailhouse with goals from Brumby (2), Smith, C Lowther and D Lowther.
A first half brace from Grimbleby steered College Wanderers to a 2-1 success at bottom-placed Sherpa.
Epworth Reserves raced into a two-goal lead in the opening 10 minutes on their way to a 3-2 victory at home to New Holland. Ritchie (2) and Moment were on target for Epworth.
Improving Scunthonians Reserves came from behind in the second half to draw 1-1 at Crowle Colts and make it seven points from their last three games.
Honours were even in the division one top of the table clash between Limestone Rangers and Barton Town OB Reserves.
Limestone stay a point clear at the summit after coming from behind to earn a 1-1 draw, following Kerrins' opener for the home side.
But it's AFC Brumby who are firm favourites to defend their title.
They made it eight wins out of eight with a 6-0 win at BBM – who they meet again in the final of the Centurion Shield tomorrow night.
Snowden struck four times for Brumby, including a second half hat-trick, with Graves and Finnigan the other scorers.
At the opposite end of the table, it was 13th time lucky for Crosby Colts when they finally came up with their first victory of the season, 3-2, at Epworth.
They led 1-0 at the interval before Epworth came roaring back with goals from Kirk and Prendigast.
But the Colts quickly levelled again and then snatched a late winner.
Swinefleet eased their relegation worries with a 5-2 victory at home to fellow strugglers Haxey. Hughes and Goodliffe netted for the visitors.
Third division leaders Revision stretched their 100 per cent record to 15 games in a 3-0 result at College Wanderers Reserves, thanks to Moran (2) and Wood.
Second-placed Crosby Colts Juniors were decisive 4-1 winners at third-in-the-table Luddington.
Early goals from Hilton, Fenwick and Downing put them in command, with Hilton grabbing a second in the latter stages.
Ashby Star came from behind at half time to win their fourth game on the trot in a 3-1 scoreline at West Butterwick, after Edwards had opened the scoring for the home side.
Briggensians and Barrow met in a double-header, with Brigg winning the first game 2-1 thanks to Benson and Neal.
They also led 2-0 in the second, courtesy of a brace from Taylor, but this time Barrow came back to win 3-2.
Barton Town OB Colts remain 11 points clear at the top of division four after a 5-0 victory at Limestone Rangers Reserves. Patchett (2), Sampson and Smith were on the mark early on, with an own goal completing the scoring.
AFC Blades lead the chasing pack after a 4-2 home triumph against Epworth 3rds, Sharpe and Dent each bagging a brace for the hosts.
Scunthorpe Rangers fought back from 2-0 down to draw level at Men's Health, only to be sunk by a late strike from Norris – his second of the game after Kerrigan had opened the scoring for the home side.
Parkwood remain rooted to the bottom of the table following a 1-0 home defeat against Santon for whom O'Keefe netted the only goal.