United's U23s made it four games unbeaten after coming from behind twice to earn a point at Vicarage Road.
Second half goals from Simeon Oure and defender Callum Semple helped the Blades secure a deserved share of the spoils on Monday afternoon.
United almost found a breakthrough on 25 minutes as trialist Beckley picked up the ball and hit the side netting from a tight-angle.
Just past the half hour mark, Dewhurst was forced into a save, getting down well to push away a shot from Charles.
The young stopper would be called into action again prior to the break as a through ball saw Cassidy in behind, but Dewhurst came out quickly to thwart the danger.
After the break though, Dewhurst couldn't deny the hosts going in front as MUKENA let fly from range and a wicked deflection saw it find the back of the net.
United levelled proceedings immediately though, as OURE stab home from close range following a scramble in the box.
Following the two goals, the game opened up again, although neither side created anything of note.
That was until the 75th minute, when CHARLES let fly from just outside the area and his shot nestled into the bottom corner leaving Dewhurst with little chance.
But with 79 minutes on the clock, the Blades levelled for a second time. Mallon found space on the left and his pinpoint cross was headed home powerfully by SEMPLE, to earn the Blades a point.
Blades: Dewhurst, Portman, Cantrill, Oure, Doherty, Semple, Gilmour, Slater, Hutchinson, Beckley (Parkhouse 73, Broadbent 88), Mallon.
Unused: Kelly, Williams, Gordon.