[quote=@Lucius Cypher]
If he can get his attack before his next turn begins, he’ll still get to maintain his rage, since holding an action means my turn hasn’t quiet yet ended.
[/quote]
That is not how it works. Once you end your turn, your turn ends. Readying an action is not exempt from this basic function of initiative. You specifically ready yourself to act outside of your turn by using your reaction.