Kalim had already been halfway through straightening up in surprise over what Jamil said about his sweater (although that does explain some things, and maybe he just wasn't letting himself wonder about it too hard) when Lilia announces himself, and he actually jumps a little. Next to Jamil his reaction seems positively restrained, though...

"L-Lilia??" He covers his mouth with his hand. Didn't he close the door...? (He did not close the door.)