Actually, he thinks that you are the kidnapper of his cygnets and does not really care what you did to save them, you touched them. This is unacceptable behavior by any parent and he is trying to prevent you from repeating the performance. So, no matter how well we all consider ourselves heroes for stepping in and saving little birds, animals, etc., the parents of these young just know that they do not want us touching their young! The Regal Swan