It's been a 28-year give-and-take relationship that Boyd Robertson and Vin Scully have going on here. It's also a given that neither of them take it for granted.Much of it works without a word spoken. At least, on Robertson's part.Between hand signals, index cards, spotting boards or just a knowing nod, you'll find Robertson, as the stage manager positioned to Scully's right and with his left ear always open on his headset as he sits in the SportsNet LA TV booth on the Dodger Stadium club level.