Say a woman is standing on a train platform some distance from a train leaving the station. as the train starts to leave, a man carrying a small package runs toward the train obviously trying to catch it before it goes. a train company employee sees the man running, and assists him on to the train, knocking the package loose and its contents fall on the tracks. it turns out the man was carrying fireworks which explode as the train rolls over them. the explosion causes a large object to fall on the woman standing away from the train, injuring the woman. the woman sues the train company for her injuries. a legal issue that arises in considering whether the train company should be financially responsible for the woman's injuries is (are)?