Karl returned to his old high school in Berlin where hockey is not a sport of focus. In fact, very little people know of ice hockey and the popular sport is soccer. So, Karl being tasked with growing interest in addition to just giving a motivational speech, so he showed up with fireworks and a magician. The magician was an overwhelming hit, all the children whipped out their $1400 phones to record and catch the trick of his deception, but alas, his hands were too fast for the super slow mode cameras. Checkmate robots!
The fireworks on the other hand were a disaster. During some shiny attention grabbing deception, Mr. Phantasmo threw one of his sparklers stage right to draw attention away from his feet where the real card was hidden the whole time, and unfortunately directly into the armed fireworks!

Looking back on things bringing fireworks to an indoor gymnasium was probably a very poor choice, the fire marshal said he hadn't seen such an intense inferno in his 15 years on the job, but Karl isn't one to get dragged down by past mistakes. If he was, he would most likely be locked up in an asylum somewhere.