Thats a tough one in that you cannot locate the nest, and deal with it directly. The attached video certainly shows these in full threat reaction mode, and it seems they pinpointed the camera as the threat, left their pheromone and continued with an unrelenting assault, it does show them at their worst. I have disturbed their nests at a distance but have noticed that if they do not find the threat, they calm fairly quickly and go back to normal, whereas like before they were disturbed, even if you stood in their flight path, they just go around you, but just bump that nest or make enough of a disturbance, they are out so fast it will make your head spin, if they mark you, (sting) you are in a world of shite !
They also leave a SENTRY out, so night and day, one or more is on watch, they will fly at night, as I recall from dealing with a nest years ago, from a vehicle.
The do seem to die off when the fall comes, though you may find a few left, its not like when the nest is full of them, plus being cold, the nest is usually no trouble to destroy.
Right now its a gamble, whatever you do, you must be sure that if you block them off, while doing so, you do not disturb that nest with vibration, impact etc, I am not sure if scent is an issue with these, except the pheromone, though it sounds like its possible if you duplicate what they give off;
"Hornets, like many social wasps, can mobilize the entire nest to sting in defense, which is highly dangerous to animals and humans. The attack pheromone is released in case of threat to the nest. In the case of the Asian giant hornet, Vespa mandarina, this is also used to mobilize many workers at once when attacking colonies of their prey, honey bees.[7] Three biologically active chemicals, 2-pentanol, 3-methyl-1-butanol, and 1-methylbutyl 3-methylbutanoate, have been identified for this species. In field tests, 2-pentanol alone triggered mild alarm and defensive behavior, but adding the other two compounds increased aggressiveness in a synergistic effect.[7] In the European hornet, Vespa crabro, the major compound of the alarm pheromone is 2-methyl-3-butene-2-ol.[8]
If a hornet is killed near a nest it may release pheromone which can cause the other hornets to attack. Materials that come in contact with pheromone, such as clothes, skin, and dead prey or hornets, can also trigger an attack, as can certain food flavorings, such as banana and apple flavorings, and fragrances which contain C5 alcohols and C10 esters.[7]"
In your situation, you had best think it out, call someone who is prepared or something safe, the attached video certainly is no joke, just listen to their hard bodies hitting the camera on its microphone, that alone ought to instill some serious respect of these, you will get nailed hundreds of times in seconds no doubt.
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