Which term describes dividing two or more parts by methods such as cutting or piercing?

Sever is the correct term to describe the action of dividing two or more parts through methods such as cutting or piercing. This term is commonly used in various contexts, including firefighting and emergency response, where materials or obstacles may need to be cut or pierced to access victims, extinguish a fire, or create egress routes. The process of severing typically implies a significant degree of separation or destruction, which is essential in situations requiring urgent intervention.

The other terms, while related, do not specifically convey the act of cutting or piercing. For instance, "disassemble" refers to taking apart components without necessarily implying cutting or damaging them. "Displace" involves moving something from its original position but does not denote dividing it. "Distort" means to alter something from its original state or form, which does not directly relate to the concept of cutting or piercing entities apart. Thus, sever is the most accurate and appropriate choice for the action described in the question.