I'll Explain Later
When someone has no idea what's going on but acts like they're the hero, they say 'I'll explain later' like it's a superpower. It's just a way to avoid being called out for being clueless.
He just appeared out of nowhere and said 'I'll explain later.'
She ran into a wall and said 'I'll explain later.'
He turned into a robot and said 'I'll explain later.'