Barnt Green tail- ender Gareth Williams' final over batting heroics could be the decisive moment in this year's title race.
Williams' match-winning six off the penultimate ball on the day the Green's three main rivals all lost has pushed Richard Illingworth's side 28 points clear with just five games left.
It still needed cool heads at Cherry Hill Road from Williams and his skipper to bring their two-wicket win against bottom club Leamington.
With four runs still needed from two balls, opening bowler Williams swatted Usman Awan over mid on and into the Cherry Hill Road car park.
That completed a nerveshredding final hour's play which will probably prove the turning point in the title fight. One by one, the Green had received word at the ground that their three title rivals, first West Bromwich Dartmouth, then Old Hill, then Knowle and Dorridge had all lost.
Having looked well on course to reach Leamington's 188 for six in comfort, with Simon Froggatt and Richard Wilkinson well set, the Green started to falter.
Froggatt had to retire hurt with a groin injury which threatens to sideline him at Lord's for tomorrow's National Club Knockout final against Horsham, and then Wilkinson was well stumped off Awan.
Skipper Illingworth's canny 35 not out looked like turning the tide again singlehanded. But wickets continued to fall at the other end and the former Worcestershire and England allrounder, who had earlier taken four for 57, crucially lost strike. But Williams came up with the goods.
A century from pro Ryan McLaren could not stop K&D slipping to defeat at Halesowen - a win that could have vital repercussions at the other end of the table.
Worcestershire youngster Daryl Mitchell, fresh from a victory with his county the previous day, had hit 89 and Nadeem Shahid 78 in a thirdwicket century stand that had helped Halesowen post a challenging 240 for five.
Mitchell then turned hero with the ball, finishing off K&D with three for 28, supported by main strike bowler Imran Ali's earlier four for 74.
A third win in eight games for Halesowen has lifted the 2002 title-winners out of the relegation zone, into which 1999 champions Walsall have now tumbled.
Chris Boroughs' side were humbled at Orleton Park, where reigning champions Wellington won again to all but preserve their own safety.
Elliot Wilson (four for 60) and Paul Wicker (three for 37) helped limit Wellington to 155 for nine. But runs this season on the Shropshire side's re-laid track have proved increasingly hard to come by and Walsall were skittled for just 86. Anthony O'Connor (four for 17) and Mark Downes (three for 19) did most of the damage with their opening burst.
Coventry also eased their position with the surprise slaughter of Dartmouth, young paceman Freddie Eburah taking five for 12 as Matt Rawnsley's men were rolled over for just 54. Keith Bell and Greg Smith then helped Coventry to a pressure-easing 20 points inside 16 overs.
Moseley also stayed out of the bottom two, thanks to Ian Stokes' unbeaten 134 in their winning draw at home to Himley, while Old Hill's title hopes were scuppered by Kenilworth Wardens allrounder Shitansu Kotak. After taking six for 71 in bowling out Old Hill for just 151, Kotak then hit an unbeaten 66 in an eightwickets win.