User blog comment:Annabeth and Percy/Second Dragon Fight Club Match!/@comment-23825763-20170212185020/@comment-26435499-20170306203943

Technically Astrid got the drop on Heather in that episode. Plus I think Stormfly may have assisted Astrid, I'm not sure.

Plus Astrid just happened to be the one who knocked Heather off, if it was on level ground the outcome may have been different.