Wow. This makes it exactly three times that we've seen Marten actually get angry and assertive about something. He tried to defend Faye and Dora from the Vespavenger, he got genuinely mad at Dora for nearly ruining their relationship and her friendship with Faye over the Underpants Argument, and now he's protecting a scared and apparently nigh-hysterical Hanners from a creepy cyborg man.
The lesson, apparently, is that there is one thing that can shock our Manatee on Codeine out of his normal indie nerd fugue, and make him stand up: don't ever, ever hurt his friends.