Yeah, I would be concerned about them coming out of the hose awhile after it was turned off. I think I might spray a little Raid down the mouth of the vacuum while it was still going, and that would certainly finish them all off.

What my friend did with the vacuum and the hornets was interesting. She wanted to simply get the individual hornets that were mostly crawling around on her windows out of the house, so she stretched a nylon stocking over the end of the hose, thus creating a soft barrier through which the air could pass. By then turning on the vacuum she could direct the hose toward a single hornet, and he'd get sucked onto the nylon net and held there. She would then go to the front door, point the hose outside and turn off the vacuum. The puzzled hornet would fall off the hose, thinking "Ah...good. The big wind has ceased..." and it would fly off none the worse.

You could not do this with a nest, however, only with a single hornet at a time, so it would have been of no use in solving Kendall's problem with the yellowjackets.

In a really fierce wind hornets and wasps simply hunker down and hang on to whatever they can, waiting for it to pass. My uncle discovered this in his youth when he happened to drive his motorcycle at low speed over a wasp nest in a field. They all came pouring out to attack him, so he hit the accelerator and took off with this cloud of wasps pursuing him. Well, about 15 or 20 of them managed to land on him or the bike before he outdistanced the rest. Most were clinging to his jacket. They didn't sting, because they were paralyzed by the slipstream...they were just hanging on waiting for the big wind to stop. My uncle was flying down the road, and realizing with a sinking sensation that the wasps were not going to let go...they were going with him to his next destination. Sooner or later he would have to slow down and stop.

When he finally did stop, the wasps came to life and all got busy immediately attacking and stinging him, so he abandoned the bike and fled inside a building. He got several stings in the process.