I would argue that it is a combination of things, including sloppy writing on my part that I should have ironed out better in later edits. Looking back on it.
There were, I think many thoughts in my head when that was written…some of the very oldest and not properly reworked stuff in the book.
Here was the thought process:
Lenamare is going to be overly cautious, with this big demon, but he’s also incredibly egotistical. He’s trying to impress not only Zilquar, but the demon itself. His ego made him sloppy; but with the trappings of overdoing it…
It’s the same thing with the ring, L&J are overly confident in their own abilities and their ability to accomplish great things and have their way with lesser demons. This has made them sloppy and they shortcut stuff they shouldn’t and because of a very real impending threat they are under pressure and not really thinking clearly; combine that with the pressure/surprise of summoning a type IV by mistake and living through it: it would provide a sort of giddy ego boost that would have odd affects on your thinking and you are basically setup to screw up.
So my intention was that they gave him what would appear to a novice to be very exacting instructions and a compulsion, but that still had loopholes that they missed.
The compulsion was added because Lenamare wasn’t completely sure the orders would take, and he didn’t want Tom running around, and he wanted him back before Exador could reasonably be expected to arrive. So he ‘tacked’ it on for good measure
So combine all of that and add in what I think, personally, was some of my most inelegant writing, that I should have reworked better. In hindsight, I think more exposition on L&J’s emotions and thinking at that time to explain it, but at that point in the book I wanted them to appear more confident/bad ass and not quite so human. (Not that they really get much more human later in the book–only by comparison to Exador do they look good)