Kirishima can catch an angry tone and sympathizes, but he's not in the habit of immediately ascribing murderous intent to strangers. If he were, the conversation might be different. For the moment, this Loki just seems like formal-speaking newbie.

"Yeah. When we--" A moment's hesitation, "Me and my friend got here, we asked some questions on the network and one of the people who helped us said he'd been here for ten years. That was almost two years ago, so..." Buckle in, Loki, you could be here for a while. "What about you? How long've you been away from Asgard?"