A police officer was cruising down a suburban street when he saw a juvenile standing in the front yard of a house and holding two or three rocks. The officer then noticed another juvenile two houses down the street standing in the front yard of another property. The second juvenile was holding his head and bleeding. The homeowner of the property between where the first and second juveniles were standing wants to sue the first juvenile for trespass. To prove trespass, a plaintiff must prove an intentional invasion of the person’s property. What additional fact must the homeowner prove to support a trespass claim?