The music that accompanies it is not a useful indicator since sometimes it fails to trigger. You'll know when it starts chasing you again when you hear some choking voice sound or when you start seeing puddles of slime on the ground. With those two tricks, you'll simply breeze through it.

In circular rooms, I suggest you to let it get close to you then continue through the room, that way you're forcing it to go through the same path you take instead of going through the wall or gaps to quickly catch you. Since it doesn't make any difference if you run or walk when you cross one, walk in order to preserve stamina. To handle it, make sure not to waste your Sprint meter when you have to cross a puddle. It can also go through walls, so in circular rooms it can be dangerous, but fortunately it's not as fast as other Specimens and doesn't hurt that much. It tends to put it in bottlenecks, so you cannot dodge it the majority of times. Its method of attacking is to spawn in the rooms puddles of slime that slows you down so it can reach you. The second is to simply leave this room without reading the note, in which case it will appear in the next room, so yeah, you're doomed to meet it. One is to check the note inside this room, which will make it appear once you put down the note from the door where you entered. There are two ways to trigger its appearance. The first dangerous monster you'll encounter in Room 60, and the point where the game turns into straight horror. There's no way to deal with it, but if you have the axe, you can cut them which spares you from having to dodge them, but keep in mind you'll be wasting stamina while doing so, something you may not want to do. They're also solid, so you're forced to go around them else you'll get stuck on them.

Since you're basically worried more about what's chasing you, the appearance of this Specimen will probably catch you unguard many times, and the fact that your character in-game freezes when that happens may make you really vulnerable to any Specimen that may be close to you. Why? Because it can also appear when you're being chased by another Specimen. However, while it can't hurt you, it's possibly one of the most annoying Specimen that will appear. This causes a high sound effect to appear and your character freezes for one second, representing the fact the character you're playing as was startled with its sudden apparition (and probably you'll be startled too sometimes). They suddenly appear out of nowhere, specially if you're holding the Run button. There's different types, but I'll only show you one here. The first Specimen you'll find, it's basically a cardboard drawing of a cute or not cute monster.

Spooky's house of jumpscares game play