For the repeating dialog, apparently the technique in RPGMaker is to use a 'switch', basically a global variable. See this tutorial
I appreciate that even this does require writing the replacement dialog to follow on from the original dialog.
I do like the repeated "Spread 'em". :-) However it does not need the prior full explanation of the consequences of the search to be repeated each time. I'm not even sure the player needs a second chance every time as to whether they really want to leave the mine.