Its quite important for the army trainees to get trained with the actual weapons itself. But at the same time, an army jawan's life is too precious to be lost in a freak accident like this. Poor guy, he was not even able to serve his country before his death. Thats tragic. With the technology so advanced, can't we have something like a virtual reality training.. or atleast use a dummy grenade, which has exact weight, size etc of original, except for the power and impact. Only IMA can answer.