InfiniteWarrior
Survivor
Best example: spitter swarms. Destroy the swarm and the audio just cuts off mid-bzzzz very noticably. There could be a fade-out implemented on destruction so it doesn't sound so unnatural. Normally, a sound will fade away over the duration of a few seconds, e.g. the sound of the seaglider in Subnautica, winding down when you put it away rather than merely stopping. If zombies can still make noise after they're dispatched, a second or two of fade-out shouldn't be too troublesome. 