Asta may be known for his constant yelling, but he is also a very powerful fighter whose skills can not be ignored. His raw power is at a high level and his speed is on point as well. Euron may be able to block out pain, but it won’t matter since Asta can finish this with a single slice. Euron isn’t fast enough to dodge or counter the blow so it will be curtains for him. Asta wins.