Ok, so I am learning a lot from you guys, and building up some confidence. But... Came home from work, started with a cold stove, burned some kindling, an envi-block and some small spits down to a coal bed, raked coals forward and then loaded the stove with as much wood as I could fit it the box. (top loading, downdraft non-cat). Gradually turned the air intake down to almost all the way closed (bypass also closed). After 30 minutes fire had died down and thought I shut down the air too soon. I then opened the air control only to the next position (still almost all the way closed). 15 minutes later it was like a small explosion in the box, top door pops open and big puff of smoke blows out into my living room around the edges of the lid. I am assuming this is the "puff back" I keep reading about, and I probably should have opened the bypass before opening up the air? I've been very very careful as this is my first stove ever, but I don't remember reading in the manual anything about this, and now I'm worried about loading it up again like this and walking away. Is this operator error?