Final answer:
Apply the RICE technique to someone with lower leg pain who cannot move their leg and seek immediate medical attention to address potential severe injuries.
Step-by-step explanation:
If you find someone with pain in their lower leg (below the knee) and they cannot move it, you should follow the RICE technique: Rest, Ice, Compression, and Elevation. It is also essential to seek medical attention as soon as possible because the inability to move the leg could indicate a severe injury such as a fracture or ligament tear. While waiting for medical help, avoid moving the injured leg to prevent further damage. If the person has pre-existing medical conditions like diabetes or previous injuries, this could complicate the situation, making swift medical evaluation even more critical.