The first team slipped to a third consecutive defeat as Leatherhead left Earlsmead 3-2 winners.
Kiernan Hughes-Mason gave the visitors an 8th minute lead before Carl McCluskey equalised in the 32nd minute.
McCluskey put the Greens ahead in the 53rd, but a quickfire double from Frannie Collin, a perennial thorn in the side for Hendon, secured the points for the Surrey side.