What indicates that Cole may have sustained a serious injury after his fall?

A large lump on the side of the head can indicate a serious injury, such as a contusion or, more severely, a possible concussion or skull fracture. This physical sign suggests that there has been trauma to the head, which can potentially affect brain function and warrants immediate attention. Although behaviors like smiling, walking around, or asking for a phone might indicate that the person is not in severe distress or pain, they do not provide essential information about possible internal injuries. Physical indicators, such as the lump on the head, are crucial in assessing the severity of an injury and determining the need for further evaluation or intervention.