Vincent couldn't rightly say he didn't distrust Senna as much as she was inclined to distrust him. His adult life had taught him exactly how fickle people could be, and that innocent children weren't a given; that last part went without saying in Senna's case, no regular or innocent child would join such a Guild as she had at her age.

Yet-

"Temporal Distortion?" So far, he had no reason to treat her as anything other than a helpful member of the group. He would keep an eye on her, make sure he didn't allow any circumstances like earlier to occur again and render him vulnerable- but there was no need to actively cultivate distrust between them. For now, they had more pressing concerns. "It's too well-timed to be a coincidence, so I'd say you're not far off at the very least." Coming off his experiences immediately prior, the idea of time beginning to flow faster almost seemed completely logical. Even putting the idea of the Gods off to the side, the very fact that they could teleport around the Labyrinth's floors was enough to establish that this place was running on its own bizarre, batshit-insane logic. 

"And nothing quite as exciting as what you got your hands on," Vincent continued with a smile that was half friendly and half a smirk, as Senna asked him about his findings. "I collected some Poison and Acid Slime samples, either myself or Thoth might be able to make something out of it. I don't think anything I would have done could have triggered that tremor, but I swear it started the moment I started collecting the Acid Slime." 

That brought him to a new line of thought.

"You don't suppose it had something to do with that... Metal Slime you mentioned?" Vincent still hadn't encountered Zhan for himself, and so could only go on what Senna, Alexander and the Lexicon could tell him. "After all, it sounds like it's still alive down there." Even going by what he knew, it seemed unlikely that the Floor Guardian could be a direct cause- but once again, it seemed too well-timed to be a coincidence.