A bluff? Actually the MC unknowingly infused those runes with swords power and anything that happens to them to deface said runes that sudden infusion of power into these fools...could be fatal(again a guess, but would fit with Migen's poisoned condition being untreated)
Basically wedged a grenade with the pin pulled up their a$$es.
ooh this was perfect. the etiquete lesson, the 'curse' on their fangs and the way little dumbass migen tried to manipulate her with 'hero' talk like some common protagonist and failed, telepathy with yona... aaaah perfect
also, we seem to be followinf a pattern - first was the 'intro meeting put-down' and then a more serious smackdown right? so we should still see the 'epic finalr' for at least the richboy yandere type (that little game wws nowhere near enough, she needs to take away all his money) and of course princeling and the epic badass 'broken engagement's cene, right?