Just before Ren started bleeding, Wei was the one who could understand the change in the mana…
And he didn't delay in saying so, because Wei had his own mushroom at Silver rank, and the sensitivity that bond gave him for reading the surrounding mana network was sharper in certain ways than what a common sensitivity beast provided, a different angle of perception, attuned to the particular language of what was moving through the space.
It was fortunate, because almost everyone in the room would be moving toward Ren as soon as the blood came out.
The blood from his nose and the intensity of the mana concentration at his eyes would have every person present arriving at the same conclusion in the same moment: this had to be stopped before Ren's connections tore again.
"Don't move," said Wei, quietly but with enough urgency that the people who had been about to move didn't move. "Wait a moment."
Everyone looked at him.
