From what you said, i think i know about it, Let me guess, you attack a Fellow, the fellow keeps following you after 20 sec you become white but the fellow will still chase you, when it kills your fellow (or kills you) he gets a murder and you kill him hoping for items.
That is it, right?
Because that looks like an ancient wolf
glitch that was used to get botters naked (like a few years ago, lol).
Hope that it is close to what i said