Even though Pike didn´t exactly help you, at least he left you a clue to check out the Silver Disco.
As the front entrance is a no-go, you´ll need to find some other way.
Let´s try the back entrance. But we´ll have to get there first. Let´s explore this building to see if there´s a way. Just proceed to the emergency exit.
Once you´re at the disco, you´re gonna have to figure out what´s going on.
First, please help the waitress collect the glasses.
To be able to proceed, please clear the dance floor. Clear the tiles and drag the sponge over the blood spills.
As we explore the disco further, we find an interesting note. We have to stop Vampyr from opening the Hellscape portal and unleashing the demons. Let´s get to work.
First, as we open the door on the left, we´ll have to deal with a shaped-stone puzzle. This shouldn´t be a problem.
Once you place the stones correctly, please push the button.
As we can see, the cable leads to a gate. But we´ll have to activate the red part as well.
Let´s see where the red cable leads. Please clear the area and exchange the electric boxes with the black contacts for the ones with the red contacts.
You can check the solution here.
Once this is done, the gate opens and you can proceed.
We´ll have to defeat Vampyr´s Servant. Hurry up and pour some fog into the ventilation so Fluffy can kick his vampire butt. Once you connect the pipeline correctly, use the valves marked by red arrows in the picture below and then you´ll be able to activate the fog in the ventilation.
Thanks to you Diggy, Fluffy was able to beat the servant. Well done!