He'd been arguing with Kaylee, because it seemed like the thing to do, since he apparently only could have two different emotions when he was upset - he could be dead to the world, flat on his back and miserable, or he could be furiously angry with anything that looked at him funny and be miserable. Though he supposed the latter was a slight improvement, he did wish that he could go back to his usual state of only slightly miserable, but he supposed he would have to wait for that.
But in this particular case, he seemed desperate to find someone to blame that wasn't Jaime, and it was easier to blame Kaylee for being a negligent neighbour and friend than to take the blame himself for not doing a better job of... checking up on her. Of making her stick around where he could see her, spend time with her. He could have done more, rather than sitting around and feeling sorry for himself and all his troubles. Other people had troubles too. But it was easier to yell at Kaylee, or Simon, or pretty much everyone else rather than acknowledge that fact.
Though, of course, because he was busy yelling, he missed the redhead come in. Slipping back into the infirmary, grumbling and holding his head from the throbbing ache it was starting up, he settled his eyes irritably on the girl and bit back a 'who the hell are you' before it could burst out. He wasn't really an ass. All the time. At least, he hoped he wasn't.
"Sorry, wasn't around to catch your name," he mumbled, slipping into a chair he was growing quite comfortable in the last... day or so, since hearing about the... accident. "M'Mal," he added since it was only fair, his eyes settling on the... jewelry thing that Jaime had acquired in his absence. "Whatchu got there?" he asked, leaning in to get a better look.