Thor smiled down lightly at Katherine, eying the weapon she twirled. He was nervous for her to use it in this room where he was unaware of what it did, how it did, or what Laura had in store. More or less he wanted to assist as needed as well as observe. They had their own lessons, their own meetings, in which he broke down the training of an Asgard warrior.
"No, I have not," Thor said. "Though, I am aware of some of it's use. I am interested to see how it works."