I HIGHLY disagree it is always about flow. I mix country into rap into disco but never DROP the tempo always increase the tempo. This is a key elelment of many very succesful DJ's out there.
You should always build energy on the dance floor.
What you say might be true, but even MORE true is that these two songs just don't belong playing next to each other, regardless of BPM. At the VERY LEAST you need some DJ intervention between them....
