((The demon's perception is based off of the Schrodinger's cat Paradox. He both accepts Albretch's illusion as the truth as well as disbelieving it. to put it another way. the Demon sees both truth and lies as separate images next to each other.))
The demon prevents Albretch from tampering with the runes. He doesn't actually physically stop Albretch, he just steps into his way.
Alucard shoots the Demon with a powerful shot of Mundaneness. The demon looks at Alucard almost as if viewing his true self.
Albrecht studies his options, before sidestepping him, pulling his gun and firing a quick shot, not at the demon, but at the leg of the person writing the runes.
((For once, I agree. That's quite bullshit considering Albrecht doesn't even use conventional magic. I demand at least a roll to see if Albrecht fools him

))