An afflicted creature can take any harm. Even one hit point of damage will quickly finish the outcome of Hypnotic Pattern. Note that other, non-harmful results will not likely break Hypnotic pattern early. Austen will make us flavor the unspeakable, unbearable, vanished agony of this type of likelihood, but Luckily, https://www.youtube.com/watch?v=8TsidOF0he0