Under normal circumstances.
Orsaga could not really do anything to Pennywise at that moment.
Because, no matter what, his presence within the Dark Tower Plane was only an avatar.
Even if it was a relatively powerful avatar, it was still just an avatar.
It was somewhat weaker than even Shi Tiankong.
Naturally, it was unlikely to be able to do much against someone who qualified as an Abyss Lord as long as he remained within the plane.
But the overall structure of the Dark Tower Plane was rather unusual.
At the center of all things stood a tower, the Dark Tower.
All stories, or rather, the flow of cause and effect, essentially unfolded within that Dark Tower.
And the tower rested on the back of a great turtle—Mazhuling.
Within this plane, that being was one of the Guardian Gods of the Order Side.
Its duty was to protect the Dark Tower alongside the other Guardian Gods.
So.
It and the other Guardian Gods would not allow other beings of their level to recklessly unleash excessively dangerous power within the Dark Tower.
As a result, the power Pennywise could wield inside was severely limited.
He also had to follow certain special rules.
So.
Even though he was a hundred percent native to this place.
And should, in principle, have enjoyed a home-field advantage.
While Orsaga remained in the Dark Tower, Pennywise could only suppress his power to roughly the same level as Orsaga's avatar—the Bloody King—which was the upper limit the Dark Tower could safely accommodate, and compete with Orsaga on equal footing.
Honestly.
If the tower were replaced with a barber pole, it would convey the shared sentiment and warning of all the Guardian Gods even more indelibly.
No going berserk in this barbershop.
They were practically calling them out