I was rereading the chapter & this paragraph caught my eye.Apeiron's mask was falling away with the change. Actually, all of his clothing was shifting with him. Even in its jury-rigged state it was holding its new form, growing with the man or slightly altering itself to account for his new shape. It created the impression that this was something that he was prepared for, something he expected to have to deal with. Everyone else might have been blindsided by this, but Apeiron, despite not seeming at all pleased about the situation, had contingencies in place.
If anyone else in this universe noticed this (and they will), then it'll reinforce the idea that Apeiron is a Case 53 that created his own cure. After all, why create clothing that'll shift to match an alternate form if you don't have an alternate form?
Looking at Apeiron on the screen he didn't look like he was falling back. The shot was zoomed in from ground level, making it a little shaky, but you could still see the rage on the man's face. And something else.
Every person in the group immediately tensed. They knew that look, that posture. The feeling that the tinker was suddenly somewhere else, dealing with something they couldn't see. Theories about what he was actually doing were all over the place. Power switching was a popular idea, as was the fabled 'strategy trance'. But those were just theories. Nobody had any actual insight to the situation.
Everyone agreed it was something serious. The fact that the man had unleashed a nuclear-level sword attack after one of those trances was proof enough. If there was ever a time where something like that would be helpful, it would be now.
But something was off. Usually there was this sense of contemplation, like the tinker was considering something. This time he was clearly annoyed by it, like some unwelcome intrusion had occurred. Then his expression changed, and it was clear he was well past the point of being annoyed. She couldn't call an expression like that anything short of murderous.
Also, the comment about Apeiron looking annoyed during his "strategy stance" might be interpreted as Apeiron realizing that he'd have to return to his Case 53 form in order to be capable of fighting Lung & being absolutely furious about the idea of having to do so (something that I think any Case 53 share after being cured).
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Lastly, I wonder if Vicky (or anyone else) will realize that Apeiron is in contact with his "passenger". That his "Thinker" power is really his Powers communicating with him.