Dennis, a 10-year-old, saw his 11-year-old neighbor, Margaret, walking ahead of him on the sidewalk. He called out, threatening to throw an apple at her. Margaret became furious, and when Dennis turned his back, Margaret threw an apple at him. The apple missed Dennis, who then decided to point an empty squirt gun at Margaret. Dennis knew that the squirt gun was unloaded, but he wanted to scare Margaret. Margaret saw Dennis pointing the squirt gun at her and yelled, "A little water isn't going to scare me!" Dennis pulled the trigger and then shouted, "See, it wasn't even loaded." The next day, Margaret wanted to make up with Dennis and offered him some lemonade, but Dennis had an unexpected allergic reaction to the lemonade and was rushed to the hospital, where he recovered.

What causes of action does Dennis have against Margaret? What defenses may Margaret raise? Discuss the torts of assault and battery in your answer.