Maybe it's the scream from earlier, or something about the drain, but Gord really doesn't have the time or the patience to deal with these bloody halfling civilians anymore.
"I am the guy who ran off to fight a bunch of wraiths for strangers," he almost snarls, "instead of running the other way when you said they were after you. I am the guy who came back, injured, to try to get you to safety. The one who's still trying to convince you instead of just turning around and leaving. I need the bag on me because if we're attacked I'll be using it to fight for your lives," even if he has no real idea how.
"You are none of you fighters. You're not competent to walk around with a bloody artifact in your pocket, and if you want to do it anyway it won't be with me, because I don't want a wraith-attracting artifact on me while trying to dodge wraiths in the night. You can put it in the bag and I'll give it back when you ask, or leave it behind on the ground for all I care, but you're not bringing it out in the open."
"I'm leaving. Who's coming with me?" Except for the horse, the horse doesn't get to decide, that's his spoils of war. "I'll cast the spell on everyone, you don't have to come with me for that."
This tirade will probably lose something in Merry's translation, but right now Gord can't really bring himself to care.