Old Dough

I had some two-week old dough sitting in the fridge -- enough to make a pizza (maybe 250 grams), and decided that I would add it to my bread dough. It stunk of beer and I was not sure what it would do. I regretted doing so almost immediately, as I did my first stretch and fold 10 minutes after incorporating it with the levain and salt. When I went to lift the dough my hand went right through the middle of it. It was like I created a super weak dough structure.