A Lot Of Luck
It turns out that the whole beehive had a lot of luck. If the toxic came in contact with other parts of the hive, it would kill all of the bees inside. Then, David would have no job here. Luckily the vax bees produce, sealed the holes and protected the hive from the toxic. It was a good thing according to david.
Another thing here is that beehives cannot survive for a long time without their queen. It was a miracle that the homeowners called DFavid in the last moment. He was the last chance for the bees and the hive. In fact, he was the last hope for the owners of the house as well. They don’t know what to do any more.