The ones that tampered with the altar were Adlet, Goldov and Tania. Goldov looks like the most suspicious one at this point, he was the one that took the sword out of the altar saying he was going to deactivate it. Even so I dont think that is a very strong argument.

If they were lied about how the barrier activates, and it was actually the oppossite (just guessing) of what they were told, it was clear that someone would pull the sword out sooner or later thinking that it would deactivate it (the opposite movement of activation they were told) so the 7th actually shouldnt do anything but wait for someone to do it and activate it. Even in the worst case scenario, unbelieveable no one would do/try it, he could pretend to do it, just like Goldov did, but not as the 1st move, that would be pretty stupid.

So basically what im saying is that we know shit. We may even have that the person that activated it didnt even do it on purpose cause we dont know how it really activates/deactivates and the writer can pull any bs explanation about the real way to do it or how it works. It can be activated with thoughts, movements, words, intentions or whatever he wants. It could had been Adlet dropping blood, Tania breaking the tablet, Chamot saying any word inside the temple, Maura, Flamie, Hans by farting.

So... I will wait until they see fit to give me wahtever bs explanation they want. I still believe that the "dream" adlet had in the 1st episode was strange. It looked like fiend tentacles going into his brain. I go with the "he doesnt know he is being used" theory.