Glad you husband is okay.
I hate to say this but those wasps can kill when they attack like that. My boss had a friend who died from one of those wasp attacks. He hit a nest with his lawn mower. I guess he was highly allergic to their stings. You should be aware of their activity in an area. I'm told you can see several flying in and out of the nest at all times when they are active during the day. Be careful. It's dangerous stuff.