because spirit bomb was not strong. it killed buu because buu is evil and the spirit bomb is good
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frieza killed krillin on planet namek when goku tried to hit him with the spirit bomb but failed also when krillin was killed goku turned super saiyan for the first time
You must do the regular spirit bomb but only a 1 and 3 chance it will be a large spirit bomb. The give me your energy move is the reason for the large spirit bomb because it amplifies the spirit bomb up to 3 times. I hope this helps because this is the conclusion I came up with in my Dragon Ball Raging Blast
Goku survived after beating Frieza by taking Captain Ginyu's ship, which had survived the destruction of Namek. He landed in the planet of the Yardrats, and stayed there until returning to Earth.
Goku turns Super Saiyan on Episode 80: Transformed at Last. Frieza miraculously survives the blow from Goku's Spirit Bomb. Frieza kills Piccolo when he pushes Goku out of the way from Frieza's attack, thus sacrificing himself in the process. He then crushes Krillin to bits which was too unbearable for Goku to handle. Krillin is one of Goku's best friends and to have to see this unleashes a transformation in Goku. He has never felt this way before causing him to transform into a legendary Super Saiyan right before Frieza's eyes. Goku realizes that Frieza has caused far too much destruction and murdered many innocent lives. He is determined to end his reign of terror for good with his new form.
Episode 95: Transformed at Last. After being hit by the spirit bomb and taking a short leave of absence, Frieza returns and levitates Krillin, then explodes him. This happens near the end of the episode (around 19 minutes into my 24:11 file)