Now then. This is a method which has been used by some breeders in Europe for decades and Wally Shaw has been testing over the last few years.
When Swarm preps are made (ie: charged queen cells seen), I separate the brood + queen from flyers. My set-up looks like this: new BB on the bottom with 1 frame of BIAS, Qx, 2 super, demaree board with fine mesh over Qx, original brood box with all brood and queen. I tend to put the entrance of the demaree board facing the same direction as the bottom box. I have previously placed it the opposite way but was a pain when inspecting.
Within a few days all Qcs will have been teared down as all the flyers have left and returned to the bottom. The queen carries on laying as normal. In the bottom box flyers will make EQcs from the frame of BIAS. After 10 days I can either remove this frame and place the queen back down the bottom between 2 frames (the top will make a new queen or you can remove the fine mesh and run it as a demaree) or give them another frame of BIAS and repeat the process for another 10 days. After this the swarming fever will have passed and I will remove the demaree board and unite over the super with air freshener. I wait another 5-6 days and reconfigure the hive with 2BB or just a single 1.
I hope it makes sense.
@Do224 I hope it answers your question, yes as a reactive measure