It's easy enough to understand why a person might look at someone like they'd sprouted extra eyes after writing something so bizarre and it doesn't matter where they come from for that to be true. A local would be just as confused by the identifiers, meaning Blake isn't doing all that good of a job getting the idea across.

He writes It's a bit like this... and a similar message appears out of thin air within a moment, sparkling happily from the small tabletop.

It's just like writing... except weirder. And in your mind.
Should Wrench decide to read and acknowledge the message, at the bottom he will find it's signed simply: Blake. His own writing isn't great so Abraxas has given him something fully legible, lucky for this man.