I was interacting with a badger in some light combat and we noticed an odd behavior when I was repeatedly tripping them over with tail sweep.  They would get up and attempt a charge, but couldn't knock me over.  In fact, he was pretty much stuck on me and would every once in a while push me back one block, but otherwise the badger couldn't do anything else except attempt to move in my direction.  Once I get out of the way, or trip them again, it would disrupt the behavior and eventually bring the charge to an end.  We repeated this several times and could get the behavior to replicate.  It seemed I had to repeatedly tail sweep them, and it would cause the bug.  I'm sure there is a timing thing involved because it takes several attempts to make it work, but typically we could get a replication within 20 seconds or so.