Payment plan with a vet and the tube near the stomach would be a catheter if the cat couldn't wee for the suspected injuries and the one left in the paw would have been bandaged and would have been left in in case thecat needed to be put on a drip again, the drip contains alol required nutrients as it sounds like the cat was obviously traumatised and couldn't eat but need fluids etc to rehydrate
Also just because they can walk on a damamged leg does not mean the leg is ok, cat would have had Metacam bu injectio to lessen pain and trauma and have been given some when let home