Wineworm are worms that suck pollen from flowers and use those pollen to make wine underground. The wine they made was delicious, and if wineworms were Qi Refining Realm, then they could make spiritual wine.
Usually, wineworms stay underground and do things underground and don't take humans seriously, but if they find a human stopping them or troubling them, the wineworm won't mind biting that human foot.
The wineworm had special poison in thier teeth that would instantly make human feel pain same as that human got crushed by 1 ton of weight on his foot. It takes servals days of treatment before pain subsidies.
Although the ten people who were busy in the orchard were extremely careful and avoided the wineworms collecting pollen on the delicate flower bones of the fruit trees, some of them accidentally bumped into the branches of some fruit trees and disturbed several wineworm.