What is the point if they can't kill the person? You don't get their gear or anything, so nidbanes are basically like sending a concussion towards the perpetrator; not an actual retribution.
Nidbanes are little bitches and you can literally just stack up con to tank 5 of them throughout the night and ignore them completely. You don't even have to log on during the nidbane's wait-period if you don't want to.
Unless the person is outside of their base and within range of their walls, there is no way that you will ever kill a full-health character. If the person is standing inside of a house or out of render of people who can agro the bane repeatedly like this, they are just KO'd and the banes disappear. Notice how many times we needed to KO the guy in the video to actually kill him. Normal banes would never get that many opportunities to deal damage.
I didn't manage to test with a murder scent so hopefully those banes can finish the job
