Magnus's mouth was set in a hard line. Despite all of the rules against weapons in this hotel, he did have a knife on him. He had pretended not to, of course, since he doubted his new cop friend would appreciate him deviating from the rules, but now it might come in handy. Before that, he would need to find a way to get more of an advantage on the situation. He had been hoping the person would have shown themselves, thinking that maybe waiting and biding their time would be better than hunting them out, though he wasn't really sure how interrogation situations were supposed to work. He usually just did his job and was done with it, no questions needed. Stupid police work.
He sighed, eyeing up the intruder. She seemed like she could be a formidable foe, so it was best not to underestimate her. Magnus himself sometimes tried to get people to underestimate him by joking around and acting the fool before striking. Perhaps he could try that strategy here. He didn't recognize the woman, and doubted that she would know he was–he did not make a habit of letting people know anything about himself. Maybe he could use his silence and lack of much of the work that had gone into this interrogation as a way for the woman to underestimate him so he could gain the upper hand.
"I guess I don't have much of a choice," he said as he began to untie Jakob. He kept his eyes more wide and startled-looking. After all, he had looked startled as the woman had jumped out of the closet. He was really out of his element now, but once he could get closer to the woman without Mercy in the way, he would be able to take care of things. He just had to figure out how. Sure, he could have held his knife to Jakob's throat, but knowing the nature of those commonly associated with the gang, he doubted she would stop Magnus from killing Jakob if the alternative was to let them go free. He had to think like his opponent so he would be able to anticipate any moves they might make.
He worked clumsily as he untied the man, hoping it would look like he didn't know what he was doing. It wasn't often he really needed to tie people up, since most of his targets were wanted dead, not alive, so it wasn't exactly difficult to pretend he had trouble with the knots. This might give him a little time to gauge this woman's character and give him more insight to see what she might do. If he could guess his opponent's next moves correctly, then he would be on the path to victory.