Demo will “borrow” the Eye Lander (even when Merasmus warns him not too) and during that, Meramaus will be teaching Soldier, Scout and Pyro some fire bending techniques. Soldier sucks, he just can’t control fire. (think Zhao)
Later on, Demo goes missing and everyone spits up to go look for him. Soldier find him first and discovers that the eye lander is controlling Demo to attack others (wants heads). Soldier is trying to save his best friend but he may hurt Demo in the process.
At this moment, Soldier will finally understand how important it is to control his fire bending.