Panic
The elementals now had one motive, one drive left in them - revenge.
They didn’t care too much about their physical bodies, they could just get another - but the treants slain would never rise again, they were bound to the wood.
The nest spore was also something that took a lot of time and a lot of cooperation to construct.
The elementals weren’t foolish beings, but when they inhabited their wooden bodies, they became limited.
It was not like they were half-wood and half-elemental; in their wooden bodies, they were still 100% elemental, and at the same time, they were 100% wood - they simply didn’t have all the capabilities they would normally have while in their spirit forms, such as higher intelligence.
Still, their emotions would respond the same, and right now they felt rage.
Without warning, the elementals went for the closest targets they could find.