He does his Spirit Boom and defeats buu hope this helps.
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During the fight with Buu, Goku was dead.
Goku doesn't die after Majin buu. Simple as that.
GOKU
Goku and Vegeta take Majin Buu (the fat one) out of super buu
Super Buu > Kid Buu -Kaioshin just said Kid Buu is just most DANGEROUS OF ALL BUU that not mean him is the strongest -Goku When Inside Buu him say him can't beat super buu if him go out him would be killed -Super Buu is more smart than Kid Buu -Piccolo even think SSJ Gotenks stronger than SSJ3 Goku who par with Kid Buu Ultimate Gohan > SSJ3 Gotenks >= Super Buu >>>>SSJ3 Goku = Kid Buu