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The use of angle iron when lowering a victim from lattice work or bus work primarily serves the purpose of creating friction for the lowering process. By introducing angle iron into the system, it increases the friction along the handline, which is critical for safely controlling the descent of the victim. This added friction helps to manage the speed at which the person is lowered, ensuring that it is done in a controlled manner.

Creating friction is essential in rescue operations to prevent rapid descent, which could lead to injury. It acts as a braking system that allows the operator to lower the victim smoothly and steadily. The design of angle iron can provide a secure grip point and enable precise handling of the rope, contributing significantly to the safety of the entire operation.

Other options may relate to aspects of rescue operations but do not address the specific role of angle iron in this context.