Harriers were rocked by the quick three-goal blast and missed a good chance to pull one back on 65 minutes.
Foster put in a good ball from the left and it fell kindly for Blake off a defender only for the skipper to pull his shot wide from 15 yards. Skipper Mark Blake missed a good chance to pull a goal back for under-siege Harriers
And sad Harriers were dead and buried on 70 minutes when midfielder Spring scored his second goal of the game to make it 4-1.
Taylor's left-wing cross was only cleared to the edge of the area by substitute Joy and Spring hammered home a crisp low finish that gave Brock no chance.
Luton made a double substitution two minutes from time, with Forbes and Hughes on for Howard and Berkovic respectively.
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