They are nasty little punks. The husband and I were sitting outside once in the fall, and one landed on his arm and stung him immediately. He had not made any sort of movement after the landing, either.
One went down my shirt and stung me in the chest while I was in my laundry room. Hurt for about 2 weeks.
They are known to like breast meat.
They will bite AND sting at the same time.