I've said it before, but fakie ollie to tailslide. How you gonna approach frontside and do a backside tailslide just because you're riding backwards? Same story riding up backside and frontside tailsliding. Unwholesome. Just call them backwards frontside and backside tailslides, since even "fakie fs/bs tailslide" is confusing. Are you talking about the way you rode up, or the trick you ollied into?