He’s at a loss
Not all teachers know their way around computers, as we had to learn the hard way, especially during the last couple of moths. Some of us have a natural sense when it comes to computers and technology, and others are at a loss when looking at a computer. That’s okay; it can happen to anyone, and there’s no shame in asking for help.
It seems as if this teacher was having some difficulties with his presentation. As luck would have it, the slide projector was directed at his head, rather than the screen, and the word “help” was reflected on his forehead. It’s almost as if he was sending an unconscious signal to his students, saying he’s new at this.