Whew! So when I hit spline, the rotation on the hammer exploded quite extremely. Tried Euler filters, tried reanimating from scratch, and had the same issue. Luckily, my buddy John Fielding is a MASTER of Maya and helped me out. Turns out the rotation order was wrong for how the hammer was spinning. He copied the animation onto a locator and was able to troubleshoot which rotation order was correct. Now I can do that for next time I face an issue like this. I hope to hear critique on this and spruce up the environment and post it to my reel!