When the whole huge room was back to normal, Erik was completely exhausted, he was practically out of strength, but he didn't want it to show.
Erik frowned, as he was staring coldly at Emma. 'I didn't expect her to attack so fast' He couldn't believe that the vampire would attack, as soon as he removed her shackles.
Erik knew very well that as soon as he released Emma, she would look for some way to attack, but he didn't expect it to be that fast. He thought Emma would attack him once his back was turned or waiting for him to give some opening.
'Good thing he had this ability' Erik relieved that he had this ability. Because if it wasn't for that ability, he would be dead.
Why was I sure she would die? Well, the answer is quite simple: Emma is much stronger than Erik.