When Chesney put a hand on the back of Le Roux's head in the 20th minute and propelled him into touch and on into a water button the side of the pitch, howls of outrage came from the stands.
Le Roux was uninjured, but the face of the Worcester captain, Pat Sanderson, mixed anger with anxiety as he rushed to retaliate. To everyone's surprise Chesney was only shown a yellow card, along with Allan Dickens and Worcester's Andre van Niekirk.It is likely that the RFU will take a harsher view.
There was no question that Saracens, who scored four tries, should have won. But when they lost just about every front-row player and scrums became uncontested they made a tactical error, swapping their bigger forwards for more mobile ones.
Worcester put on their heavyweights and started setting up driving mauls, which presented them with their last-minute victory when the prop Tony Windo bullocked through for his team's third try.
If there is to be any feedback from the Chesney incident it should be either tomorrow or Wednesday.
Worcester: Tries Hickey, Windo; Penalty try; Conversions Drahm 2; Penalties Drahm 2. Saracens: Tries Scarbrough 2, Haughton, Castaignède; Conversions Jackson 2.
Worcester: N Le Roux; J Hylton, D Rasmussen, T Lombard (G Trueman, 73), B Hinshelwood; S Drahm, A Gomarsall (M Powell, 59); T Windo, A van Niekirk (C Fortey, 59), C Horsman (T Taumoepeau, 80), P Murphy (T Collier, 61), C Gillies, S Vaili (C Fortey 29-34; K Horstmann, 68), P Sanderson (capt), D Hickey.
Saracens: D Scarbrough; R Haughton, T Castaignède, K Sorrell, P Bailey; G Jackson, A Dickens; K Yates (N Lloyd, 29-53; B T Russell, 62), S Byrne (M Cairns, 58), B Broster (Yates, 53-57; T Randell, 59), K Chesney (S Raiwalui, 62), H Vyvyan (capt), A Sanderson, D Seymour, B Skirving.
Referee: D Pearson (Northumberland).