My body vanished
I was playing on the battelgrounds TO map in third-person when everything turned blue for about a second (health and stamina meters were still visible) and when everything turned back I was in first-person and I could only see my sword. I couldn’t see my shield or arms.
Also during a match on Stoneshill Castle at one point my body went completely black except for the helmet. I assume this happened when I was hit by a firepot or the oil but I couldn’t tell.
The black thing is you being hit with the oil.