The Bracken Woods don't look at me

Fire shot through his neck suddenly, and he registered a moment later that Runion had bitten him there, too; his teeth tore deep into the flesh, and blood immediately began to pulse from the wound in thick waves. He felt nauseous, the taste and scent of blood choking him now. In that moment, he let go.
The next blow to land fell across his face. One of Runion's teeth caught his brow, sailing down past it and ripping through flesh the entire way. It happened too quickly to close his eye; a ragged gasp tore itself from his throat at the sensation, eyes snapping shut just a moment too late. Blood welled quickly, carving a path down his cheek, and for several beats he didn't know where he was, or what was going on— all he knew was that it hurt.
He didn't know how long it had been— not more than a minute or two— but when he finally flickered back to awareness, he realized he hadn't gone unconscious at all. Soft flesh pulsed under his jaws, mouth filling with thick, hot blood. He bit down harder, then shook his brother violently by whatever section of him he'd grabbed. His teeth worked into the wound, deepening it as he tore further into him. His eyes were closed the whole time.