Bat disappears after hitting the player and then reaching the pivot point

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Expected Behavior

The bat should move towards the player until it hits the player. Once it has hit the player, the bat should then move towards a random point away from the player (this is called the pivot point). Once it has reached the pivot point, the bat should turn around and once again move towards the player.

Experienced Behavior

The bat successfully moves towards the player, attacks the player, and moves to the pivot point. The bug arises when the bat should be moving back toward the player. For some reason, the doesn't move back towards the player. Instead, it just disappears.

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This may not be related, but in some cases it seems possible for bats to get stuck on the other side of a wall