Last night, i fought this piscine wyvern in order to get the fin for my Ples armor S upgrade. I use my Blue Yian Kut-Ku cannon and shoot it fin to break it up then suddenly that stupid fish tackle me and almost depleted my HP. I got furious and shoot it stomach with normal bullet Lv 2 and make him flinched with the fin broken? I mean i doesn't targeting the fin but the fin is broken automaticly, is this normal or only a glicth for ples?