So what happens at FL380 and 205KIAS/Mach 0.67 15deg nose up, if full thrust is applied and there is compressor stall on the left hand engine? You now have full thrust on the right engine and drag from the left engine.
I'm assuming you're not a pilot? Multi-engine aircraft are designed / certified such that above Vmca speed (which is lower than takeoff speed), there will be sufficient control authority even with the most critical engine out and the other engine set to full thrust. So at M0.67 losing an engine (by itself) should not cause a fatal accident.
Now, at high-angle nose up, if the airspeed decays rapidly while conversely the AoA increases rapidly (resulting in a stall), then a one-engine-out situation at that point becomes deadly.