Joel Lynch took just 43 seconds to head home against his former club and well-worked goals from Nakhi Wells and Grant Holt either side of half-time capped an excellent display by the Championship outfit, who are now unbeaten in their last seven outings.
"That was an outstanding display today," said Powell. "We made a perfect start obviously, but for us to play the way we did - I though our game management was superb.
"Some of our football, our wing play and our finishing was a real joy today and I was really proud of all the players because, even in the 93rd and 94th minute, we were putting our bodies on the line to try and keep a clean sheet and that's the attitude that will take us forward.
"From afar I saw what was happening here - it was tough, you could see everyone in the football club and all the players were a bit disaffected by what had happened, and that's understandable.
"Basically I've done my best to try and install confidence - of course results help.
"I wanted intensity, I wanted good football, wing play when we could, but good balance in the team, and we're getting there with that.
"They're really trying their best and enjoying each other and enjoying their football and they all want to play their part - it's great to see.
"I knew when I had my interview that it was a good football club here and I'd be able to implement exactly what I want.
"The chairman wants us to overachieve as a team, but we're realistic with where we are and what we are financially.
"I'm going to push them to be the best they can because you just never know where that will take you."
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