His pain threshold must be unhealthily high. That already occurred to Loki, based on what little he knows about his affliction, his powers. You deal with that sort of illness for the majority of your life, and a motor vehicle accident probably feels like equivalent to a head cold. That doesn't mean he couldn't die from it, though. Mortals do that, even if they're unusual ones.

By Midgard standards, it's an expensive cloak, probably. Loki isn't sure they even have all the materials in it on the planet. It feels like satin, but warms like wool or fleece. Evidently he's not worried about getting blood or grass stains on it, though.

"Probably broken bones or dislocated joints, then. That's a relief; I can't do much for a damaged spinal column, but I can manage bleeding and fractures. I'm going to have to poke at you a little, and it's going to hurt, all right? Try not to lash out; if you hit me you'll only hurt your hands worse."

He doesn't want to know what happens if he fires polka-dots at him.

He tugs his gloves off and tosses them aside, placing one hand just over the injured knee, the other beneath it and pressing gingerly, using both magic and touch to gauge where the worst damage is.

"Oh! And warn me if you're going to pass out." He can do a painkilling spell in a minute, but diagnosis comes first, then easing the symptoms.