Hydra Jump Glitch (Dark Souls)

In Ash Lake, there's a Hydra that's famously known to die on it's own, now you get to see how and why. The hydra jump can be triggered when you are a certain distance within his aggro range and just far enough that he can't hit you. Mid-jump you need to get the oyster enemy to block his dive path, by getting it to stand up. It seems the hydra's hitbox clips with the oyster enemy and the game assumes it's no longer where it should be and removes it. Or as another person put it, it's possible that it misses the gravity check and falls into the killbox area. There's no known proof of anyone figuring this out yet or video of it online.