Does krav maga teach you how to get out of a fireman's carry if someone is carrying you over their shoulder?

There are no specific techniques that I know of to get out of a fireman’s carry that you’re already in, but there are plenty to prevent it from happening in the first place! For example, there’s a technique to halt someone who’s rushing you from the front in an attempt to get their arms around your waist (I think I actually had Levi use that, or a modified version of it, in one of the SoS books). There’s also a really cool technique for escaping a front bear hug that’s lifting you off your feet.

Krav Maga practitioners would consider the fact that you got put into an unwilling fireman’s carry to mean that you already failed at like three different points along the way. Of course, that doesn’t mean they’d say you should just give up if it happened! A fireman’s carry is a terrible way to hold an unwilling person - the attacker is put off balance, trying to use one arm to restrain someone who’s probably thrashing and squirming, and the defender’s hands are totally free.

Off the top of my head, you could start grabbing things out of the attacker’s pants pockets and throw them as distractions or use them as weapons. Grab the attacker’s keys and stab them repeatedly into the attacker’s kidneys. (You could probably get a few solid hammerfists to the kidneys as well.) Get your hands under their shirt and tear their skin up with your nails. Bite whatever you can reach. Just really get in there and ruin their day.

Unless there was a truly significant size difference between the attacker and the defender, it shouldn’t be too hard for a determined defender to get out of a fireman’s carry, although it wouldn’t be graceful. The fireman’s carry and the more military-style version (where the person being carried is draped over both of your shoulders, and you’re holding one arm and one leg) are specifically designed to transport people who are either willing or unconscious. An attacker who knew what they were doing would never attempt to carry a victim this way without knocking the victim out first, or at the very least restraining the person’s hands and feet.