So i was replaying YBB and when i was about to finish the boss, the health bar showed he was at 0, but since he didn't die i tried to damage him one more time, but he didn't take any damage! I try to hit him like 8 more times (even getting really close) and he's still not dead. So im now softlocked. My theory is that the boss ends when Stalk's health is at 0, and i somehow made his health a negative number.