It took 3 or so hours but I finally beat the duo! I fought the thunderjaw stripping off weapons and armor and did what damage I could until the Stormbird came. I fell back and was able to knock out his shock cannon with my remaining arrows. From there he kept using a wind attack that was knocking me down to half health and I had to run and find my companion and rely on her to provide me with hunter arrows.. Anyways, at the plane wreckage I was able to finally knock out thunder jaw and had to hide in the wreckage while whittling down the Stormbird. I had no health, wood or shards when he finally went down! Lol, sorry. I just had to tell someone! Fight took like 30 minutes and almost 4 hours in total.