He wasn't Peter. Eric killed. He Avenged. Those that opposed him would die. Nothing would stand in his way when there was something to fight for. Leeloo had invited him into this brawl and he would not hold back. He couldn't. It wasn't within him to restrain himself from slaughtering all of them.
But the look on her face when she glanced at him told him he had crossed the line. So instead of divulging further in the fight he backed up and waited. He would not kill in front of her. Not unless she approved.
Bran cawed and the rain poured harder almost, as if it could. And in it Eric could smell the tinges of ash.