I was thinking back and that was a critical point in the battle that essentially saved Goku's life but also allowed Gohan to look up at the power ball (blutz ball?) and transform himself. Let's say Yajirobe was too much of a coward to do anything. What do you think would have happened at this point? Would Vegeta have killed Goku? Would Gohan still been able to transform?... Maybe there would have been an ape vs ape battle?