The Black Devil people were changing outfits, and Zhang Yong was changing as well. What equipment were they switching to? Of course, it's for training and exercises; they couldn't use live ammunition, could they? With these people's style and capability, they'd all be dead by the end of an exercise.
Yang Yi wasn't worried about anyone else, just concerned whether Zhang Yong's body could handle it. But seeing Zhang Yong's excited and expectant expression, Yang Yi wisely said nothing.
An exercise is just an exercise. No matter how much it simulates, even if it's lifelike, it can't 100% replicate real combat. Just like their weapons, which are laser-based. Upon hitting the signal receiver, it indicates the person has been "killed," either by emitting smoke or vibrating, to show the hit individual has lost combat capability.
