he’s not hard at all, just keep looking at him while going backwards and don’t stand idle for too long. It takes him 4 seconds to spawn on the map in every room.
Step 1: Specimen 3, several times Step 2: Tirsiak (once she's available, anyway) Step 3: observe the fabled "Waifu Conga Line Migration", where the Tirsiaks fly north for the Summer.