I think i found a bug. I was playing normal, but then I became invincible, and all the bullets weren't doing anything. I continued on with the assassination and went to the escape hole. As soon as i stepped on to the hole the game stopped doing anything.
NOOOOOO! I beat the boss and the game crashed, I wasn't worried because it had happened twice before,but then all my progress was gone when I restored. WTF! WHY ME!