User blog:SpongeBobLove/Half and Half Horse

While I was playing Undead Nightmare, trying to complete the Undead Hunter rank 3 challenge, I happened upon something strange. I was outside the gates of El Presidio, throwing Undead Bait for Retchers. The Retchers hurled their glowing spit on John, but he was unfazed (I had the invincibility cheat on). However, it had a strange effect on my Painted Quarter Horse. The Retchers landed some spit on it, and the entire left half of it turned blood red. I thought it looked really cool, so I tried to find a hitching post, but the red half of my horse appeared to evaporate. Can someone tell me if/how I can keep it permanently? Or how it started? Is it the horse's blood?