[Yup, Bolin can keep secrets real good...]

Sure can! I didn't realize I could do it until this bad guy who could also lavabend tried to bury us in a volcano. We were escaping through this cave, but the lava eventually came down the passageway, threatening to burn us alive! And I went up to it, held up my hands, and then... hissssssss! I was able to turn it all back to solid rock!