Oh, it's horrible no matter what you call it.
Some of that is from the tumblr, not the comic. That's an example of why I'm ambivalent about the tumblr. On one hand, it can provide excellent background information. On the other, if the information is provided later in the comic, putting the information in the tumblr first can spoil the reveal. I think I'm going to mostly avoid the tumblr, unless I think something really needs explaining.
If you get something from the tumblr, rather than the comic, would you please say so? That way people won't check the wrong place to see where it said so.
I don't see where Ruck says so. I think he was avoiding humans until he heard about Duane, then started chasing after Duane and Delicieu.