Darlington were the first to threaten in the second half on 50 minutes when Conlon soared above the defence to head Valentine's corner over the bar.
Harriers took the lead three minutes later after a controversial penalty award from referee Walton who ruled Ducros had been tripped by Betts while moving onto a Henriksen pass.
The Darlington full-back was booked for the foul and Foster cheekily chipped home the penalty for his first goal of the season. Ian Foster
Ducros could have doubled the advantage on 57 minutes after being sent clear by Henriksen but keeper Collett saved well with his legs at his near post.
Darlington were now chasing the game and made a triple substitution on 58 minutes with Hadland, Wainwright and Alexander on for Naylor, Clark and Cullen.
It worked for the visitors as they equalised on 61 minutes with Conlon again meeting a Valentine corner at the far post but this time the ball flew into Brock's net.
Conlon then headed wide after a good run and cross from the right from Hadland.
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