Usually before the game, the player who first enters the stage pours both glasses of water. O'Connor was first on the walk-on; but only filled his own glass.
Lewis understandably confronted O'Connor about this and said that it was done deliberately. O'Connor supposedly had done it on the advice of Peter Wright; who does it tactically.
As a result of this, Lewis found the extra motivation he needed to claim victory, he said afterwards in an interview with MC, Elmar Paulke.
View the incident below:
https://twitter.com/SportMoments4Al/status/1173964795218989056
https://twitter.com/SportMoments4Al/status/1173964925049479168