Which training activity requires additional instructors to observe safety-related details?

Live fire training in a burning building necessitates additional instructors to ensure safety-related details are observed due to the inherently dangerous nature of the activity. This type of training involves actual flames and structural conditions that can rapidly change, presenting significant risks to both the participants and the instructors. Having extra instructors enables a focused observation of safety protocols, helps monitor the training evolution in real-time, and ensures that all safety measures are being adhered to. This oversight is crucial in preventing accidents and managing any emergencies that may arise during the training scenario.

In contrast, the other activities listed, while important for training, do not entail the same level of risk where immediate additional oversight is essential for safety. Thus, they typically do not require the same number of additional instructors.