Durham 205 (Bedingham 81, Chahal 4-36) and 246 for 7 (Lees 80) lead Northamptonshire 263 (Sales 69, Zaib 52, Potts 4-49, Stokes 3-58) by 188 runs
But with just six overs remaining, Procter returned to claim his 200th first-class wicket when he trapped Stokes lbw and then picked up Colin Ackermann first ball. Agarwal then fell just before the close of play, as Yuzvendra Chahal and Calvin Harrison both took two wickets on a pitch offering prodigious turn.
In the morning, Northamptonshire secured a handy first-innings lead of 58 before they were bowled out for 263, Lewis McManus finishing unbeaten on 29. Matthew Potts claimed the final three wickets to finish with figures of 4 for 49, while Stokes took 3 for 58.
Earlier, resuming on 225 for 7 after a delayed start due to rain, Northamptonshire soon lost Louis Kimber when he shouldered arms to Potts and was bowled. McManus and Ben Sanderson then counterattacked, adding 36 for the ninth wicket as they earned their side a precious batting bonus point.
McManus square-drove Stokes for four while Sanderson struck a pacy full delivery from Potts down the ground, before Potts wrapped up the innings in the space of two balls. First, Sanderson hit low to mid-off, while Chahal was done for pace and bowled.
Ben McKinney played a few lusty blows but never looked entirely settled, troubled by both the spinners and Sanderson’s away movement. Lees meanwhile looked more composed, driving both Procter and Chahal through the covers.
Durham had almost wiped out the deficit when McKinney misjudged the length and went back to one that spun sharply from Harrison and was bowled off the final ball before lunch.
After the interval, as Northamptonshire rotated their spinners, Durham largely played watchfully with Lees and Will Rhodes marking a stand of 64 in 24 overs. Lees, though, did take on Chahal, driving through cover and striking him for a straight six into the upper tier of the Spencer Pavilion.
Amid a series of confident lbw appeals from Harrison, the legspinner instead made the breakthrough with a sharp bit of fielding at backward point as Rhodes was run out for 27.
Dangerman David Bedingham could only add 5 to his first-innings 81 before he was trapped lbw by Chahal. The Indian international then removed Lees just before tea with one that drifted away before spinning back to hit middle stump.
Both sides went toe-to-toe after tea with neither able to dominate for the first 90 minutes. Chahal had a strong lbw shout turned down against Stokes before Agarwal pulled him through midwicket.
Stokes smashed Sanderson straight to bring up the 150 and reverse swept Chahal behind square. But for the most part, the experienced Northants bowling pair kept the Durham batters honest and were largely treated with respect in return.
Agarwal got one away through the covers off Nathan McSweeney, but the Australian found sharp turn and bounce to trouble Stokes as Northants persisted with spin.
Stokes broke the tension by reverse-sweeping Harrison square for four before Procter’s double-strike. After he trapped Stokes lbw, Ackermann was caught at slip before Agarwal was adjudged caught by George Bartlett at short leg off Harrison, although replays suggested the ball had come off pad, not bat.
