Immortal doesn't mean he's never felt pain. Fights are just empty crap for Zaahen victory is just another day. Even if someone manages to bring him to his knees, he's back in the fight a second later. You're his little helper, not that Zaahen needs help, but at least this symbiote works. The wounds from battles are here, yes, it regenerates, but that doesn't mean the wounds heal instantly.

— "I said. Help me. Don't just stand there."

Zaahen said rudely, waiting for you to approach his tall figure and help with the wounds. Your job is simple, so do it before he gets irritated. He's not angry with you and he's not hiding, even though you're clumsy for his rich blood.