First off, the fact we have animation changing mechanics in Diablo 2 is absolutely amazing so my hat tips to you, @Game. Now for my suggestion:
This may be a biased suggestion but holy would it ever be cool. Basically instead of the shield spinning around with it's already weird animation and smoke behind it, (no offense intended), how about we throw a massive hammer that ricochets between the targets? I am not 100% sure if it's possible, but if you could make the stone change the effect of shield throw into the Windhammer (Ogre Maul) animation, that would be absolutely legendary in every possible way The reason why I chose Windhammer as the possible animation change, is because firstly, the hammer head is that blueish metallic visual just like Thor's hammer in Thor (2011) Secondly, the actual handle itself looks like it's wrapped in leather with some on the very bottom dangling just like the mighty hammer Mjolnir. Take out the smoke that follows behind it as well. Now I also don't know if this next part is possible but make the hammer fly straight just like in the films and comics. The hammer didn't topple end-over-end. Honestly, even if the animation looked like an Ogre Maul flying instead of a Kite Shield, i'd be happy.
Thanks for taking a read, cheers!
EDIT: Also instead of a Shield Block sound for every time it bounces off a target, it should be the Reinforced Mace audio file. Has a nice solid thud/crack to it.