Yo, I just realised that I never specified the difference between steam and water vapor in the Powers section of Jack's sheet. Basically, while he cannot make ice or snow from water that has become steam due to being heated, he CAN make it from the water vapor in the air, because of the difference in energy. I also wanted to add that this ability is where many of the myths about the Jotun's control over weather come from, since they can create the snow from the water in the air, not from the clouds. (After all, how would a Jotun get INTO the clouds to try and control them?)