User blog comment:Omega natsu2/Fairy Tail Episode 209: Wendy vs. Aquarius: Let's Play at an Amusement Park, Review./@comment-108.28.233.191-20141122041159

Natsu didn't get thrown by a mega punch. Loki was going to punch him and some stream of darkness came out of nowhere surprising both Loki and Natsu and washed over both of them. Presumably Loki was washed to a different area.