Yet again, he was bested. As Klaus's body worked to keep him 'alive' and conscious, working to dispel what was preventing him from drawing breath, his mind was racing to try and piece together what this was. An alien, no doubt. Nothing from Earth behaved in such a manner. His judgment had been off, he should have listened harder to monitor heartbeats and breathing. He should've asked when he first chose to compel her. It was a lesson painfully learned. His temper continued to flare, though it was quelled for a moment when the girl - if she could even be called that - took on a shockingly different form. He was bound before he even realized what was happening and it occurred to Klaus that he would have to approach this differently. Blind rage wasn't working.
His lungs burned and he glared darkly at the girl. He recognized the symbol on her necklace - a zodiac sign, which was distinctly Earthly in origin. The knowledge proved even more intriguing, something filed away until he could get to a point where breathing was easy and he could try to find the upper hand. Klaus snarled at her singsong tone. Apologies were not thing he just handed out. Certainly not to someone who would dare attack him (never mind he'd just attacked her). The snarl quickly turned into a gargled sound of pain as the liquid in his throat sharpened. He struggled immensely against her, throwing all of his inhuman strength behind it, only to get nowhere.
As much as it wounded his pride, Klaus stilled. He could now add whoever this was to his list of people he hated, right along with witches. He worked to speak but couldn't get any words out. They would've been threats not apologies, but Klaus fell silent and just glowered dangerously at the charade of a woman who held him.