"Not in the same sense, no." Emotions of the Valar and even Maiar can have quite drastic effects on the world, but in the sense of everyone having emotion based powers—even Men—definitely not. The fact that he cannot master his own yet only serves to illustrate that fact.

Mairon is very busy learning all ways of this world, so he is familiar with the concept of dunamis—and everything else one can easily learn from the visitor center and helpful long-term residents. Still, learning such things in depth takes time.

The yard is nothing special, just a space for the smiths to move supplies through, and store things when necessary. Yet it is relatively empty now, and quiet. Mairon brought the sword with him into the marketplace to show anyone who was curious or perhaps needed some convincing, but this is where the experimenting can actually take place.

"If you're prepared, we can begin. As I said, it will not take much effort, or much of your time."