The Dutch pace bowler, who last week accidentally struck Jimmy Adams a blow to the cheek that kept him out of the West Indies' Test team at Trent Bridge, was twice no-balled for short-pitched deliveries at Nigel Llong, having already sent down one bouncer in the over.
In his next over Van Troost knocked the bat out of Graham Cowdrey's hands with a high full toss and Dudleston instructed Somerset's captain, Andy Hayhurst, to remove him immediately for the rest of the innings.
Middlesex took full advantage of a poor Durham performance to step up their pursuit of the Championship at Chester-le-Street. After making their lowest total during the winning run that has carried them into second place, they made quick inroads into the Durham batting, reducing them to 17 for 2 at the close. After choosing to bat on a pitch offering steep bounce, Middlesex mustered 307, thanks to a fine innings of 89 by John Carr.