Looks like I did a huge no no. I was planning on harvesting a super today, so yesterday I put on my triangle ecscape board. Trouble is, I forgot that the ventillated innercover (which I put over the super) has a top entrance. Woke up this morning, looked out and there were thousands of bees all over the hive, covering top entrance and flying , bees dropping to the ground, apparently fighting. I took a wet sheet out and threw it over the hive and almost immediatly they went after another hive that has the same vent. innercover. Took anothger wet sheet out and threw it over that one. I have 3 other hives without top entrance, and no problems.
Is there anything else I should do? Sometimes you just have to experience something to learn how a small mistake can turn into bedlam.