Vampire bats spawning mechanics is incomplete

Despite character quotes suggesting that vampire bats spawn from the spooky hole in cave clefts, they have no spawning animation, they just come into being and gets placed in the room. It would be fine if they don't spawn in the interior the player is currently in, but it does, so you might see bats just spawning on top of you.

The bat attack is also half baked, the bat spawned from attack does not inherit properties of those from the caves, so even if you have previously attacked them, they still come with full health. The bats picked from the caves also lacks proper filtering, a frozen bat can still be chosen for bat attack for example.