To recap, Spahn and another CIA guy were interrogating disarmed prisoners one by one, and interrogated Lindh, who concealed that he spoke English. Thus, Lindh overheard anything they said in presumed confidence to each other. Lindh was then returned to the group of prisoners. Shortly thereafter, the prisoners murderously rushed en masse the two CIA guys, who were armed only with pistols.
So yeah, you pretty much summed it up.
Holy God, I didn’t know that. How did this guy get away with his skin intact (i.e. without being hanged)?!