[Herbert makes the most undignified screech/squeak when he's grabbed, his eyes going wide in fear. He's been in this position too many times not to know what comes next, to know that he's going to be hurting before long. He scrambles for his wand, fumbling across his body to try and pull it out of his pocket, underage restriction against magic or no.]

Don't- ! [The soft purring just makes it worse - it makes it utterly clear that Maxim'll enjoy whatever he plans to do to the much smaller boy, and Herbert's never been held up with a knife before. His whole frame trembles with tension and fear ... where the hell is his wand?!]