I think the thing is- shippers gon' hate- we all have a friend like Hanners who is a little more vulnerable and a little more in need of defense than others. I oscillate between Faye and Hanners as my favorite character, because they are so similar and yet so different. Both have crippling personal issues tempered by a steely strength that comes out when needed. They have both overcome some of their issues, making them a better/happier person. Faye happens to be a hardass on the outside, whereas Hanners is more reserved about it- and vice versa regarding the issues.
I feel this has a part in why Marten feels so protective- he knows what Faye went through to come up to the surface, and wants to make it easier for Hanners than he was able to for Faye. It's not about romantic interest or anything, it's about being a friend and using your prior experiences to make things easier for others. Hanners is still struggling with her OCD, her asocial tendencies, and her other issues to become what she wants to be- normal with a normal life. For someone doing that, the interference of the likes of Clinton can be destructive. What better way to bolster social anxiety than to force someone to be afraid of going about their day because of YOUR lack of social boundaries? Who the heck takes a picture without waiting for permission? Worse, who plans on putting up a picture like this on a message board without even asking permission? I don't have near as many social anxieties as Hannelore has, and I would freak out about that. It's called basic respect- and Clint ain't givin' it.
Also, where does everyone in this comic get their swords? Is it a Terry Pratchett thing where they make them themselves? Also, I don't think Faye would have an issue with this guy, robotic hand or not. Marten... well, all bets are off when someone scares that vulnerable friend I mentioned earlier.