Why Are The Animations Broken?
The most probable reason for animations not working in the mod is incompatibilities with other mods. Mods that add their own animations have a high probability of braking this mod's animations. Try deinstalling the other mod to see if the animations work again.
Optifine defaulty breaks the animations of Legends Mods. However, there is a way to get them to work together. Follow the special installation below to allow compatibility between the mods:
1. Install Legends Core
2. Install SUM
3. Install Optifine
4. Rename the Optifine jar to (1)optifine
5. Install bspkrsCore
Explaination: The reason you must rename optifine to (1)optifine is to get it to load before the Legends Core does. Basically, if any mod breaks animations for this mod, rename them so they load up before the Legends Core does (where all Legends Mod's animations are stored). The bspkrsCore doesn't have to be renamed due to the file name being [1.7.10]bspkrsCore-universal-6.16, causing it to alphabetically load up before the Legends Core.
NOTE: THIS DOES NOT WORK WITHOUT THE BSPKRSCORE!