Does DS not invite tunneling?
We all been in this scenario, you hook someone, doors are open, you play fairly and look around a bit, they unhook.
You come back and now there is one wounded and one full health.
Hitting the full health in this case means an ez escape for both.
Hitting the wounded means they are downed, now they are crawling to the exit, let them crawl and they will escape, pick them up and you get DSed and they escape.
So really, if you want to prevent that all too common scenario (and I think we all agree it is pretty bs that there is nothing you can do about it as killer) you have to tunnel early on to atleast make sure people used up their DS before that can happen right?