Ursula, Wendy, Xavier, Yvonne, and Zack, a group of first year law students decided to throw a party in their house to celebrate passing their exams. The following events took place: (a) Wendy was in the kitchen preparing a drink for herself. Xavier crept up to her and placed his arms around Wendy's waist and kissed the back of her neck. Wendy screamed, at which point Xavier let go. Wendy then turned around and threw her drink in Xavier's face. She then grabbed a kitchen knife, pointed it at Xavier and said, "Pull a stunt like that again and this'll end up between your ribs". (b) Ursula, Yvonne and Zack were dancing when Zack pulled out a water pistol from his pocket and aimed it at both of them. Yvonne laughed but Ursula, thinking the gun was real (because the room was quite dark), collapsed and fainted, banging her head. Yvonne and Zack carried Ursula to a bedroom and left her on the bed under a pile of coats. When she came around Ursula felt trapped and had a panic attack. (c) After a row with Yvonne, Zack sent her an anonymous text message that read: "IMPORTANT. POLICE MESSAGE. YOUR MOTHER HAS DIED IN A CAR ACCIDENT. PLEASE CALL 999." Yvonne read the message, vomited, and went into total shock, as a result of which she has withdrawn from university Advise the parties as to their tresspass to a person liabilities in the law of torts?