He almost grins with triumph, feeling the mouth in his palm instinctively seek to rip and latch upon the woman's skin. That grin swiftly turns into a harsh hiss of surprise. His power can't pierce her skin, nor his claws through the shield. He turns away as she kicks, but she catches him in the ribs hard enough to likely have cracked a few. That'll take time and sustenance to heal.

Ultimately Marius is a scavenging predator, not a fighter. Survival supercedes greed, and so he suddenly retreats back into the safety of the nethervoid. He has to tell the Queen.