A nuc should be a complete but small functioning hive. as such it has bees of all types and ages. including those that are old and dying. A half dozen bees is nothing to be concerned about. Just because we can box up bees and haul them all over the place. keep them for a time in a space that is far less than adequate. As well as riffle through there homes at any given whim. does not mean 1. they can tolerate it. 2. it is good for them. or 3. it does not result in killing many of them.
Any time you handle you bees for any reason. you will kill some of them.
Any time you handle you bees for any reason. you will kill some of them.