The 3-1 reverse leaves Forest one place outside the bottom three.
Dyche lamented afterwards: "Three awful goals, you can't give away goals like that at this level. Credit to them, they deserved it. We warned the players, we know the atmosphere in here and all the talk of it. We started playing well, we made two chances, but you can't get done with a straight ball over the top with your unit all staring at the ball.
"Then we give away a second that's not great. I actually thought we were still in it at that point. Then the third goal and you're just scratching your head because they're miles off what we usually do as a unit.
"We expected a fast start, I thought we handled that as well as we could. I thought we calmed it and we found pockets, started asking questions of their back line. To concede the first... they drive you mad those ones.
"They're the basic principles. We tried to play offside for no reason, I don't like that anyway. Then they score a goal out of a nothing situation. Then the third is a real headscratcher. The whole place changes and we had a couple of chances in the second half as well.
"I'm not going to over-question the players and I thought the subs were good. The mentality is there."