No, you haven't Arch, you can't skip cause and effect, we told you to leave the castle alone until the event had ended. In short back off.
Actually... the demon can manipulate cause and effect. It's part of his Embeds. He wants to get into the castle, he can get into the castle. He's got enough physical power to just force his way inside, considering he can simply slice the gate to ribbons, or cause it to simply break at a touch. It's no less ridiculous than anything else. He's a paradoxical reality shifting being made by the God Machine.
And Lantz, you can always just have Saber Alter intercept him or something. We haven't really seen anything from her lately. Either that or I'll create a scenario inside the castle myself, though you may not like the results, but I can assure you it won't interfere with your BDSM.
Also, Lantz;
Irony. Oh the irony.