B.O.B. is a peculiar ult that doesn't act like any other. He is basically another teammate since he can capture and stall objectives and react to enemy CC options like a normal player. He's powerful, but he is useless when the enemy team targets him. You want to use your judgment to determine if a fight is about to ensue. When both teams have fully committed to a brawl, use B.O.B. to add chaos.