Yeah, people really need to stop saying that this is some kind of dues ex machina just because they can't string enough braincells together to remember the plot...
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I'll be frank, I haven't read every single chapter of this arc, but I have read the last 7 or so chapters.
And still, with confidence, this is a deus ex machina, or something not very far off from it.
A hole, opening up conveniently, precisely at their exact position. The hole
literally opened beneath the feet of the villains so quickly and fiercely, that it captured only the villains, and it saved them.
A hole, opened up in what is probably a pretty long staircase, and they heard nothing but a few shakes? Imagine a building collapsing beneath you, you wouldn't see any smoke? Dust? NOISE? Nothing? Why is it so immediate and sudden? They got teleported? Was the floor beneath them like 5 inches away, and the hole tore through the floor itself? It's not a deus ex machina? You want me to keep going?
Ya'know what, let's assume it's not: if in the past 15 or so chapters it was shown that the floor can crumble out of nowhere for seemingly no reason, sure. It's weak writing, but it's not quite deus ex machina anymore.
Regardless what it is -- whether it's a utter and complete cop-out, or just a weak cop-out -- the matter of the fact, is that this scene is utter weaksauce. The MC was put so hard against the wall, with everything stacked against him, and every reader was expecting the MC to find a clever, or satisfying way for him to make escape.
Instead, the floor beneath their feet just crumbled away.
It wasn't that the MC had a magical ring that had a spell engraved on it for emergencies, and thus created the hole himself in a last-ditch effort to escape,
It wasn't that the MC used that party's sheer malicious hubris against them to get eaten by the monsters from that room they're literally a few inches from, and thus override the slavery item...
No, it was a god damn hole in the floor. Do you actually think that this sort of writing makes sense, even for these sort of low-effort stories?
On that note, I wrote way too much already about this stupid thing...