Fungus Behemoth teleports me out of the boss room

When fighting the Fungus Behemoth in a map, he does a teleport move (usually teleports the player into the center of the room on top of the fungus). He teleported me out of the boss arena.

Now, earlier in the map I fought the same boss from the "click the three pillars to summon a boss" thingie. He teleported me on top of the three pillars.