Forum:Zanji vs goyo guardian

This is somthing that happened when we were dueling:

I had in my side of the field grandmaster and zanji face up in attack position and a face up skill drain and my opponent had goyo guardian. It was my turn and I attacked goyo guardian with my zanji, since zanji wasn't face up on the field when its effect resolved I destroyed goyo guardian with Its effect. (And that how we resolve It, we didn't do nothing concerning goyo guardian effect). Was our resolution correct?