Trunks decides that fighting Piccolo at
this point could result in his destruction. Grief
striken, he quickly flies out of harm's way and returns
to Capsule Corp. He tells the gang what happened
to Vegeta, and they're all shocked. Everyone tells
Trunks that it wasn't his fault what happened, but Trunks
refuses to forgive himself for what happened.
He spends quite a long time in sorrow and regret.