NO I AM ABSOLUTELY CERTAIN!!! It did not run away on me. It was ONE ONLY. I have shot a Walther PPK/S before (my Dad has one). I know how they can fire quickly after first hard pull. That absolutely did not happen. I did not have finger on trigger.
I did not mean to imply you had your finger on the trigger. Just stating that it would be more likely repeated firing by a faulty firearm than there being 2 rounds in the chamber that went off at the same time.