I find it interesting that Krosp did not get knocked out by the doom bell. Is it because he is not human or is it for some other reason? At first I thought maybe it was sparks that didn't get knocked out but than I realized that would be rather ineffective as a weapon. And when we saw several sparks pass out I realized for sure it did affect them.
So now I am pondering on just what makes it so certain people pass out and others do not. We already know that the "
dead" are unaffected so just how does this bell work? We know that the Jäger's are not affected by the bell. So there is the possibility that it attacks certain parts of the brain and unless said parts are sufficiently strong enough (or sufficiently different enough) the bell would overload them and they would pass out? Now if it is done that way I have to wonder if something near Mechanicsburg helps pass on this "change/strengthening".
I suppose that maybe the Heterodynes could have a genetic predisposition towards whatever this immunity is and than maybe the townsfolk picked up something from the remaining dyne water which could indicate that the water is not quite as benign as once suspected (unless of course it is a closely guarded secret, that way their enemies would not be able to acquire the water as away to build an immunity. Now if it is something along that line it would stand to reason that Klaus would know about it and would have built an immunity into Gil. But once again this will all remain speculation until further facts have been presented forward.