One episode earlier, things were in different directions. Last episode Danny was facing the sun and had the worst vision/line of sight. This episode she came out of the sun and it was Euron and company that was at a disadvantage. She then came around from behind, like she had learned something from the previous encounter. She hit the ones on the wall from the back as well. So how it went down was reasonable. If it accounts for 100% hit going to 100% miss is up to what you can accept, I thought there was going to be a hit or two on the dragon, but to something inconsequential.