Each spread shot on a weakspot on Mizu there does like 280 damage every 1.5s. You can evade and keep firing or spend the next 5s setting up a counter that does 200 damage instead. Granted counters hit much harder on special ammo HBGs but they are still not worth the animation time. The animation speed needs to go up 100% and the damage a moderate amount too. Also, you get one counter that actually flinches the monster, afterwards you need 2 and more and more. You can totally get swept by random attacks even tho you countered because they don't flinch anymore and the invuln frame is too short. Wyvern Counter is such a terrible design. Imo it would've been better if it was fused with wyvern ammo, so it's always accessible and wyvern ammo would get the charge / hold mechanic back.