Thanks for the chapter!
Very devious. Although the flaws with that mine is that it needs a magic trigger to flow down a line to detonate it, if the demolitionist gets discovered and killed the mines will lose their trigger, and if the line gets cut won't be able to set mine off without getting closer raising chances of either being discovered or too close to mine. On the other hand don't have to worry about it going off under some poor kid's foot who steps on it weeks or months after the battle.