I think DH just made them watch some Blast T20 and showed them the importance of being really positive, especially in the powerplay. Granted they're not facing a hectic bowling attack and can afford to see off a few really good deliveres, but you just have to keep taking calculated risks and the total will come.
If you post 60 plus in the powerplay the game is over against these sides. I'll tell you if it's a dead cert win after 6 overs or not.