Shawn was pissed. And he wasn't pissed at anyone but at himself. Today, he broke Emily's trust in one of the worst ways ever.
Why the hell didn't he just tell her from the beginning? Well maybe it was because he wanted her to have more time without thinking about the heavy burden she's going to be carrying on her shoulders for a long time. Or maybe it's because a part of him didn't want her to find out. Even if he knew it was impossible for her not to.
Shawn approached an underground dungeon that has been there for over fifty years. It was built on the training grounds meant for his warriors. It was quite far away from the city and it was very secluded. This is because in order to run a secret operation like this, they needed a private but handy location.