Obviously you should be doing compressions only on a giraffe.
Look at how far the blood has to go to get to the brain, you can’t afford the time do to rescue breaths.
Plus consider how far the lungs are away from the mouth and how large they are. There’s no way your 2 puny exhales have enough pressure to get there, let alone inflate the lungs enough to oxygenate anything.
No, it’s abundantly clear you need to do compressions only until someone gets the giraffine AED.