Let's play hide and seek! NO! This game isn't what you think! This is named Seek Chase as you can see from the picture. Seek is the second antagonist in doors and he looks like a glitchy cyclop like Screech. He will spawn before and after the Library to chase you and kill you.
It's hard to beat because you need to practise it. It took me one week to beat him but I think you will do better than me. Be careful because you must crouch to some furniture that's glowing and pick the right doors quickly! It's not that easy because if you stop he will get you.
The best way to do this is as soon as you go into the room, check the right or left side, if it's glowing obviously go there, if it's not look in the opposite direction to check for the blue glow and if that door is also not glowing continue running straight.
At the end furniture and lights will fall off and set on fire so you will have to go left right and left again. When you finish it, the song will end and you will only hear Seek's footsteps. Good luck! I've died 86 times and even now because sometimes the game glitches out.