Anti AFK-Mechanic?

So... I was playing feed the children on toxic shock mode

And then I went away to get a snack. Enemies never look into the hiding place you are hiding in. Only if they saw you entering it. Knowing I could not be found, I hid in a barrel to be safe. I was not gone for too long (maybe 3 minutes or something) and upon returning I heard a big grunt stomping my way, so I remained in the barrel for a moment.

But guess what. The big grunt came running straight into my direction and pulled me out of the barrel.

To be clear, I was not moving and I did not peek out of the barrel. Not a big deal since I was only on intensive difficulty. But it got me thinking. Is there an anti AFK-Mechanic, so AFKing Players get killed and the rest of the team can continue?