Didn't catch anything in this passage.
Hmmm... Maybe God was saving David from more heartache by using Achish to send David back to Ziklag.
Ooh... Having read the whole of 1 Samuel, I know that 1 Samuel 30 is about the Almalekites destroying Ziklag.
David being sent back to Ziklag gave him time to pursue his enemies, destroy his and Israel's enemies and take back their women and livestock.
Daddy, I need confirmation on this.