Blackfeather Woods I'm starting to notice a sound

A howl rung through the woods.
Panic. Fear.
It was a newcomer.
What was happening in Mephala's Darkness?

He spurred into a quick lope, aiming to arrive at the source of the howl as quick as possible, all the while uttering his prayer.
"Mephala...protect those..in your darkest protection."
Stone swooped low, angling towards where Takion was.
Sounds of pain and death rose from the area. Not tonight Sithis. Please.
He slowed - not by much though, just enough to not blunder into Takion - and his eyes rested on the form of Zephyr. Struggling.
"Zeph," his heart raced faster than it had during his run here.

Was it the tree? Had he spent too long in its effects without Rowan knowing?
He moved in as he collapsed. There were no more screams.
Rowan lowered his muzzle to Zephyr, glancing to a visibly distressed Takion.
"What happened?"
Sithis clutched him.