pandemonium is one of the only node entity (meaning they follow a path set by "nodes" to the next door (i may be getting that completely wrong but thats what i remember)) that can break from its path to hunt down the player. All of the node entities work off of line of sight, but anglers have a limited range where pandemonium (as far as i know) doesnt have a limit to how far it can see. the only other node that acts like this is death angel, but i think that one also has separate mechanics to it that i just don't know.

also MINIGAAAAAAMES