User blog comment:SSWerty/Should ST be updated?/@comment-1668079-20110405055021/@comment-1668079-20110405085412

My thoughts for that part of the story is that Goku was warned that Serroli would be breaking free soon, and he was to go there to see if he could somehow stop it happening. He takes Vegeta as he doesn't think he's strong enough to take Serroli down by himself. They land and trigger the trap, which replaces them with Serroli.

Simple enough?