Well timed "Rope Whipping" Sessions? Rope Whip tends to make them barf more than usual, yet if you time it well and let them rest a bit, they won't die quickly. At least that's my theory after playing it myself.
>>.......How the heck did whoever took this manage to get the yukkuris to barf up that much without dieing? Yukkuris die after they vomit two times in a row and it can be interrupted by punching or kicking them after the first vomiting.