The most effective way to take care of big daddy is non other than using ... ( I can't remember whats the skillz name is ) emits electric shock while being hit. This should stun the big daddy like 2 to 3 sec. While looking at big daddy getting the shock of his life, why not pump some more shotgun electro to it or better yet exploding shell. Once u get your full upgrade on shotgun. Big Daddy ain't nothing but a toy. So have fun !! oh yeah, and those checking guides for " First Encounter " by andrew ryan. Don't bother checking. Its no in arcadia but in Bounty area. So don't get confuse and go finding for something that is not there.