Basic sigil magic is what I was thinking of when I wrote that. I noticed the spell also includes Belial, which can make things very… interesting, to say the least.
But of course, shit happens in real life all the time. I’ve also had things a go wrong after I did magick and then I’d be like… oh shit, was that the magick? But it wasn’t the magick that caused it (and in some cases that’s completely sure). So don’t worry too much but just be cautious. Working with Demons in that way is not exactly the safest, and on the LHP many consider pain to be a good thing, but Demons are intelligent beings and likely won’t cause something so very against your will.