Speak with Lieutenant Doren at the Rebel Camp.
Thank you for saving me, [player]. I know how this looks, but...allow me to explain.
I was charged by Lieutenant Doren to re-enlist with Kurzen's men, so that I might spy on them and bring sorely needed intelligence to the rebels. You saw here what I had thought would be my chance to infiltrate Kurzen's Compound. I was wrong, and again, thanks for saving me.
This was a top secret mission, so you must tell no one. But if you speak with Doren he will explain.