"Impossible! The current world's mana level shouldn't be able to support your true form!" One of the beasts shouted in shock.
It was the Fox and not the Tiger that shouted. The Plant Lady's transformation must have shocked it too much to the point that it couldn't stay silent anymore.
How could it not break character when the only reason they dared to fight the Plant was because it shouldn't have been able to take its true form. So the realisation of the real danger of likely dying they were in made it unable to keep its cool.
While the Plant Lady had gotten smaller after transformation. With a new height of around 25 metres. Only a little bit taller than the four beasts. They felt a lot more pressure from its new form compared to its previous form.