Mishra's 4/11 in 3 overs was instrumental in Daredevils notching up a comfortable eight-wicket win over Kings XI Punjab.
"Mishra was unlucky not to get five wickets. He is a great bowler, he got myself, Maxwell and Marsh as well, so he has been a game-changer out there," Miller told reporters after their second loss.
Not ready to blame the Feroz Shah Kotla wicket, Miller said:"It was a low-scoring game but I think we lost too many wickets in different stages which changed the momentum of the match. I think the wicket was right."
Both Miller and Maxwell were dismissed in the same over by Mishra and the skipper admitted it was a painful coincidence.
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"Mishra was bowling really well. But as trump batters, we needed to express ourself and play with freedom as well. There is a very fine line between batting with irresponsibility. I give credit to them. I guess we need to chat about that in the next couple of days," he said.
Miller said he would look to stick to what worked for them in the past and hoped that they will back to winning ways soon.
"It doesn't change. I thought to go with the same mind set, same process, stick with the things that I did in the past. I have been hitting the ball nicely and as a batsman, I believe we need to stick to what worked in the past."