https://www.youtube.com/watch?v=EFSJk5f_Ysc

It seems like the game doesn't register the soldier that the previous attack hit as dead and causes the next attack to bug out trying to hit his nonexistent body. I've seen this happen on the Warlord occasionally as well.
And while I'm on the topic, what is the point of doing heavy attacks with some characters to kill soldiers? I know some classes heavies hit multiple targets but for example Orochi's heavies hit a single target and are slow as hell.