Very unlucky it somehow got caught

Definitely possible to fix though! I can't really explain how just from those pics, but if your friend has a soldering iron and solder, it should be as easy as resoldering the wires to the battery pack. The question is which is the positive and which is negative, which he will hopefully be able to see in person. looks like there are three wires though... maybe (and this is 100% just a guess) the positive is the blue wound with the other wire and the single black is negative? (usually black is negative and red positive) worst-case scenario you get them switched up and fry the whole thing but as it is right now it doesn't work so not much to lose lol. The Anakin AOTC saber was the first fx saber ever made so the electronics are REALLY outdated at this point anyway (like almost 20 years!) so you CAN if you want- if resoldering doesn't work, have it installed with all new electronics (that's actually my main hobby that brought me to the RPF- custom saber installs.) Search "Neopixel smoothswing lightsaber" on youtube and maybe you'll decide to have it converted anyway