During a code blue today, I was performing compressions and my senior told me to not stop for delivery of breaths via bag valve mask. I had thought without an advanced airway, you do 30 compressions, pause for 3-4 seconds to allow 2 breaths at 1 second each via bag valve mask, then resume compressions and repeat. Is this correct or am I just flat out wrong and should go back to a BLS course (which was 1.5 years ago now)??