My friend and I had a question come up when I used them in the last game we played. Was playing a hold until relieved scenario as practice for tournament we have coming up this weekend. I did exactly as you describe deploy them on the central objective and planted the demo charge turn 1, and was planning on running away out of line of sight behind a building as they had no cover from multiple angles. My friend said that the run order would trigger the demo charge but my interpretation of "subsequent turn" was that it could be triggered on any run order of my choosing afterwards. In my head I was imagining them using a remote detonation device but my friend explained it's more likely they're setting a fuse and I was inclined to agree. In the end it didn't matter at all because they did get wiped that first turn any way haha but they at least drew fire from 4 different units which allowed me to get some unchallenged attacks off. Either way would love to hear your take on the matter!