Exactly. This isn't some little iconic flourish in the corner, footer, or the header. There's also some general rule of thumb with watermarks being flagrantly disregarded (keep it simple and monochromatic so it doesn't impact content legibility).

And even if I personally didn't have a problem with it, I would seriously question the competency of any law firm that mis-read their audience so dramatically. I can't imagine many courts looking at that and not having at least an immediate knee jerk reaction of "The hell is this? Are they fucking with us? Is this a joke?" which is an absurdly poor opener to your case as a lawyer.

If some firm got a headshot of the lawyer handling the case scowling and used that as the background of every page in their document they'd be laughed out of court. Just because "dragons are cool" or something doesn't make this any less silly.

Edit: The dragon icon in the footer is perfect if they wanted some visual flair to set them apart, and it's a relatively simple monochromatic design. It just makes it even more absurd that they didn't just use that and instead went for this detailed and visually busy picture.