A couple days ago I had the idea of potentially taking Skilled Partner as a class feat on my Summoner, primarily so I could give it Assurance: Athletics and get a more reliable Trip as an option for a final action on my turn. However, the feat gives your Eidolon three skill feats. The first two are conceptually easy enough, Assurance and Titan Wrestler. But I'm unsure on how Battle Cry might work.

"When you roll initiative, you can yell a mighty battle cry and Demoralize an observed foe as a free action" Since the Eidolon technically doesn't roll initiative, can it make use of this part of the feat at all? It seems like the second part is absolutely usable, just unsure on this part.