rcallahan - wtr to one engine being at 35% N1...my a/c engines idle at approx. 25-30% N1 at low altitude/airspeed. Different engines on the A320 so 31% N1 might be a reasonable estimate for an idling engine.
Based on that observation I wouldn't be surprised if one engine was stuck at idle and the other engine(12-15% N1?) was still running but obvious N1 damage was preventing the fan from spinning at the typical idle RPM.