QUESTION: My son was running in school and there was another child running to her classroom. They collided with each other and the child fell and broke her glasses. I would like to know if I am responsible for the child’s glasses since it was an accident. ANSWER: “Causation” is an essential element of a tort action. Defendants are not liable unless their conduct (i.e., act or omission constituting a breach of duty to plaintiff) was a “legal cause” of plaintiff’s injury. [Saelzler v.Advanced Group 400 (2001) 25 C4th 763,.