Im gonna take a wild guess and say it was Winchester white box?
I had a similar situation with my XDm. The round was out of spec and was stuck in the chamber. I did this.
Obviously this is a recreation. You need a safe place to do this. You need to catch the slide just above the barrel and give it a good solid push. Obviously you have to push the grip safety but do not put your finger on the trigger. It worried for me. It appears that your extractor still has a grip on the round. Good luck and be safe.