i agree if umpire do the mistakes in the field for the decisions. but they have facility to go for the 3rd umpires decision in such crutial conditions. india lost yuvraj at very crucial junture and india lost the match. such decisions shall be verified by the field umpire with the 3rd unpire. because finally you are suppposed to take full advantage of technology. another thing, if players are fined for such behaviour, then i propose ICC to also fine to the umpires for such bad decisions.